There you can upload pics in different resolutions (from 100 x 75 - called "Tiny" - up to 1 megabyte file size -- only costs you more time to load up).
Under each picture you´ve loaded up there are 4 columns, the lowest one named "IMG code". Just copy and paste this code into your post - et voilà, there you go...
Be careful - the higher the resolution you´ve chosen when uploading the bigger the picture will appear not in this post (they are automatically downsized) but when copied in this post and pasted into another folder. Normally, 15" (800 x 600) or 17" (1024 x 768) inch will be more than enough...