and upload your picture there. Then when it's done uploading you take the link that it gives you and put it into your avatar. So in steps:
1. Find the picture you want on your computer. If it's not on your computer, save it from the internet to it. 2. Go to imgur like I posted, and select 'upload images computer'. 3. Find the picture you want. 4. Press the 'start upload button'. 5. Give it a second to upload. Then when it's done you should go to another page. 6. To the right it should give you links. Choose the one that says 'direct link (email & IM)' and copy it with Ctrl + C. 7. Go to your avatar setup and choose 'Upload from a URL'. Paste the link you copied into that box with Ctrl + V. Then hit submit and you're finished.
Just remember avatars can't be bigger than 100 x 100 pixels. Meaning, it can't be any bigger than the size of the avatar you have right now. Hope this helps.
You could go to microsoft office picture manager and resize the picture there then save it onto your computer go to edit avatar then you just get it from your computer and also if you don't understand i'll just explain it a bit more clearly