How to change your avatar on Chess.com
Click the cogwheel icon ('Settings') in the bottom-left corner of any Chess.com page, then select 'All Settings.'
Select 'Profile' from the settings menu.
You’ll see your current avatar here. Click on it to upload a new image.
If you’d like to remove your current avatar without uploading a new one, click 'Remove' under your current one.
If you do not see the option to change your avatar, check out this article to learn why: Why can't I chat or post in forums or change my avatar?
What size should my avatar be?
Your avatar should be square and at least 175 x 175 pixels to ensure it appears correctly across the site.
You can use any common image file type, such as .jpeg, .png or .bmp.