wokay, let me try my best.
1. go to imageshack.us to register an account (not account also no problem, just that you dunno where you upload those pic to, and you can't manage it later)
http://www.imageshack.us/
2. browse the picture you want to upload to using the browse button, change the resolution if needed and click "HOST IT"
3. after upload, this is what you see. if you want to attached a thumbnail which have a link to view the full size picture, just copy the entire thing in Thumbnail forum (1) and post in message box in zth
and you will see this
if you copy the direct link (No.2) in the pic, use the image tools in zth, you will see this
forget about the boobs you saw in the last bottom of last pic, practice this few rounds, tomorrow teach you how to use a tool to easy the upload, no need to go the website, you can upload straight from your browser.
in case you want to know what you see after you past the code, it's like this.
The code is ugly, but it works. :)