OK i personally recommend using photobucket.com.
Once you are there, if you dont have an account setup already, do so.
There should an image upload box. upload all the pictures you want.
If you scroll down, the images you uploaded are shown.
Check the box under the pic (only one at a time) and click generate HTMLand IMG code.
It will then give you a bunch of codes. i tried all of them to see how they came out and you are better off using the one that says "IMG clickable thumbnails for message boards"
Copy and past it into the thread you are creating... and TADAAAA.
Do these steps for every picture you would like to add.
NOTE: when you are at the page that shows the different codes, do not click on the back button to get to the main page. There should be a link next to where it say s"current album". click on that instead.
HOPE I MADE THIS DUUUURRRR PROOF.