There should be an option on the website. Either ad an URL or browse your computers file for a suitable picture.

Open up your profile page, go to upload avatar, click the http://gravatar.com link or click here, fidde around, upload pics, DONE.

Press the upload button thing.

FACEPALM

lol
"Your message was too short." hate ya

@itubee
You just put the message then 3 spaces lol, job done.