Most photo-hosting sites require you to register and create albums. If you only want to show us a few pictures, Tinypic (which requires no registration and allows you simply to upload one pic at a time) is a better option.
Go here:
http://tinypic.com/
Click 'Browse'
Navigate to the location of an image. (e.g. go to your 'My Documents' or 'My Pictures' folder).
Double-click on a picture which you want us to see. It will then be uploaded to the Tinypic site.
You'll be presented with four links.
(example here:
http://tinypic.com/view.php?pic=69j4u1&s=5#.Un_WyiekRv0 )
Click on the bottom one to highlight it and then copy it (by right-clicking and selecting Copy).
Then, in an AB post, right-click and select Paste to post your link.