you need to upload your avatar to an image hosting site like ImgBB and paste the link to the image into the custom avatar section in your settings.

Not trying to hijack this thread but does imgur not work for uploading avatars? I can't seem to get ANY tags uploaded from there as it says “could not get image size. Please use another image” ;-;

yeah imgur doesn't work sadly, i just use my toyhouse images lol but if those don't work i use ImgBB as my backup

ahh lame.. but good idea, I shall use my TH images!