How Do I Make A Photo In My Mail My Avatar?

Gee, I guess no one knows how to do this.

I have no idea how to do this from a PC since I'm always on here via my phone. Is there a way you can save the photo to a file on your PC or phone and then, from here select it as your avatar?

If it's a file size issue, you will need to resize the photo before it will be suitable for selection.