Wait, meh can help! (I'm a helper 2day, lawl!). At least if what you mean by 'avatar' was profile picture/signature.
Step by step instruction for Signature:
1). I know this was said, but I'm starting from the beginning. Get a digital art program-I recommend GIMP from gimp.org. .ORG. No seedy websites. It is completely free of charge and viruses (I would know I have GIMP), but if you don't want to download something, I'd recommend going to sumopaint.com. Free to use, no download.
2). OK, once that's done, make sure you're drawing is the way you want it to be, then save to your computer. Open up tinypic and upload it, then copy the image address (the one with brackets around the letters: IMG, like so [IMG])
3). Go to your profile under 'show new replies to your posts' in the left corner under the "Hello,-" *insert your name here* the small bar, and click profile. Then click 'Forum Profile Information" on the left side bar. Then go your signature and paste the image there.
Step by step for Profile Picture:
Repeat Step One, drawing what you want for your signature.
2). Upload to tinypic and copy the URL, not the image address. Then go back to the same place you changed your signature and go to the Profile Picture section. Check the box for 'I have my own pic,' and then paste the image URL there.
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OK, hope this could be of help!