Settings > avatar. Pick a photo that is 120x120 or smaller (from your pc or the Internet) and then hit save.
To resize a picture you can open it in Paint and resize or if you have a photo waiting program you can use that. There is also resizer.com. You can upload the picture here or host it on imgur.com
to use an image from the Internet find an image via google images. Search for your topic and hit search tools at the top. Use image size - exact size (100x100 or 120x120) then it will show you only that size of images. Click one you like and pick "view oroginal image" and copy/paste the URL. It should look something like "http://www.nonrev.net/imagename.jpg"
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