One way of doing it:

Type [img] and then [/img], with no spaces in between them, into your post. Put the picture you want to post onto a web-hosted photo sharing site such as yahoo or photobucket (there are tons of them), or save them to your NAM photo gallery page. Then go to whatever picture you want to insert and right click on it. Click on 'Properties,' and highlight the url of the pic. While its hi-lighted, push ctrl+C (copy). Then put your cursor in between the [img] and the [/img] and hit ctrl+V (paste). When you post your reply, the image should show up.

 

I have always wondered what a "tet" looked like but alas still no picture of that ever ellusive little bugger

 

Let's see some TETS!