Note: I take no credit for this guide whatsoever it is c+p from
http://ffxi.allakhazam.com/forum.html?f ... 647&num=37
Just passing useful info along!

Enjoy!
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Risks Involved
Don’t do something stupid (like shouting an obvious edit in Jueno), or else you may be jailed. Though if you use these tricks in a party, linkshell, or small stuff like that, and there isn’t a prick in your pt/ls/etc., you should be fine.
Let me repeat in a more clear fashion:
YOU RISK A POSSIBLE 3 DAY SUSPENSION IF YOU DO ANY AUTOTRANS OR ELEMENT SYMBOL TRICKS.
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So we’ve all heard of weird symbols in a search comment and items in auto translate which aren’t in game yet, right? Well, I decided to write a guide for it off the information in this thread.
Table of Contents:
I. Introduction
II. Tools
III. Hex Tutorial
IV. Editing macros ingame (JP in NA POL)
V. Element Symbols
VI. Odd Autotrans items/spells/etc.
VII. Custom Autotrans
I. Introduction
Ever go to Jueno and see someone shouting to sell an item that doesn’t exist ingame, like utsusemi: san? Perhaps you saw in a blm’s macro, a symbol of fire. Maybe you once saw in a party, a person had an autotrans messages that read “【I hate you all.】【Good bye!】”. Well, I’ll teach you how to generate those spiffy icons and autotrans.
II. Tools
Here’s the reason why in order to do this, you need a PC: the tools.
# Vanahand
http://vanahand.s29.xrea.com/ : This is the JP macro editor, and is a bit tricky to use. This can be used to making custom macros, theoretically. Click on “最新版Ver.0.9.0.2ダウンロード(本体のみ/300KB)” to downoad.
If you’re having an issue with getting Vanahand to run, make sure your JP IME is on, then simply go to Start→Run→type in “Regedit”→OK→HKEY_LOCAL_MACHINE\SOFTWARE→Right click Software→New→Key→Enter “PlayOnline”→Right click PlayOnline you just created→New→Key→”InstallFolder”→Right click “InstallFolder”→New→String Value→name it “1000”→Right click modify→enter the location of your FFXI folder (not play online, not tetramaster, FFXI). Use backslashes.
After you do that, in order to open up your macros, when you run it, select directory PlayOnline→SquareEnix→Final Fantasy XI→USER→check all folders there for your characters macros.
# Pebbles’ POLUtil
http://users.telenet.be/pebbles/ : This will be your main tool for editing macros. English, so easy to use.
# JP IME!!: THIS IS REQUIRED. Not sure on non-XP systems, but in Windows XP, you have to go to Control Panel→Shortcut to Regional and Language Options→Advanced→Japanese→OK.
Please use these images if you're having problems with the IME:
Making sure east asian packs are installed
Turning on JP for non-unicode programs
# Windower: Windower is needed to edit macros ingame.
III. Hex Tutorial
Hex is like the alphabet meets counting.
Just image the hex characters like the alphabet.
ABCDEFGHIJKLMNOPQRSTUVWXYZ
Following? Good.
Now, let's do numbers.
0123456789
Easy enough. Now, before we dive into working with hex, we must understand the relationship of adding/subtratcint hex. It's just like numbers.
39+1=40
If you take 39, the first digit, 3, becomes for, and the second digit, 9, becomes 0.
Time for hex.
Now take all the possible numbers you can have as a single digit.
0123456789
Add a few more of these digits to the end, and pretend they're extra numbers.
0123456789ABCDEF
So, pretending these are numbers, 5F+1=60 because the F will reset to the first possible number, 0, and the 5 will go up 1, just like counting.
Some examples:
3C+2=3E
45-1=44
F3+1=F4
2D+1=2E
50-1=4F
IV. Editing macros ingame (JP in NA POL)
Ok, it’s very simple. Switch out of the macro set you’re going to edit buy going ctrl+↑. Now, open POLUtil or Vanahand, whatever you choose, and select the macro set you want to edit. Choose the macro, edit it, yadda yadda yadda, put JP in it if you wanna talk in Japanese (/p こんにちは!), save it (POLUtil, right click macro set, save changes. Vanahand, the (S) option under ファイル), go back ingame, switch back to that macro set you edited, and walla! The new macro is there.
V. Element Symbols
Now things get fun. If open up your macro editor, and choose a macro you want to put the elements in. Enter the following (Copy ‘n paste): ≺Element: Fire≻ ≺Element: Earth≻ ≺Element: Wind≻ ≺Element: Water≻ ≺Element: Thunder≻ ≺Element: Ice≻ ≺Element: Dark≻ ≺Element: Light≻.
Save the macro set, and woohoo! You get elements in your macros. :3
VI. Odd Autotrans items/spells/etc.
Ok… This is where the hex lesson comes in. Enter in a spell/item/ability/etc. (in order to get an item into autotrans, hit space, tab, go to items at the bottom, esc a few times, and now you can enter the most recently viewed items) into a macro and switch macro sets. Now go to your macro editor, load the macro with the items, and change the hex. He hex *should*, without the brackets/text, should look something like 7021383 (this is Mage‘s Ballad II). This may or may not include letters. Now, usually, if you just add 1 to the hex, it should give the next value, so 07021384 would be Mage’s Ballad III.
Here are some items you can enter that I found: ≺[07021354] Utsusemi: San≻ ≺[07021384] Mage's Ballad III≻ ≺[07021216] Holy II≻
VII. Custom Autotrans
Example:
pebbles macro editor:
≺BAD CHAR: EF27≻stuff here≺BAD CHAR: EF28≻
= (stuff here)
vanahand:
・"'whatever herei"・(
alt+139 alt+40 whatever here alt+139 alt+41
= (whatever here)
Also, try ï instead of ・ for vanahand. One might work, other might not.
edited for your convience