Go to http://imageshack.us/index.php

1. Click "Browse" and find your pic
2. Click resize
3. choose 640x480
4. Click "Host it"

 

 

Go to the bottom of the page and copy the link in the last box called "Direct link to image"

Go to Posting Pics on Imageshack part3

 

 

 

 

Delete "HTTP://" from the "Optinal Image URL" and paste the link.