How do I make an avatar image?!?

First you need to make an account, then click on your account name on the top right corner, then click "My Profile."

 

To the left, it shows the profile picture you have, which by default is the first letter of your username and a random color.

 

Click "upload" to upload a custom image, or just click "choose random" until you get the color of your choice.

 

Hope this helps.