Also, it seems to work best if they're only about 90pixels wide (or maybe a bit higher). If you upload something that's too large/bigger than allowed max, something about the forum resizing process seems to freeze them/they don't work.
Yeah 90 pixels. If it's even 1 pixel bigger than that then the animation won't work.
Making gif avatars/signatures is remarkably easy, just take the time to download an image editor like GIMP and learn how to layer images.
Yeah, GIMP is pretty simple to use to make custom animated gifs.