There are a couple of ways to get pictures into your posts. You can either attach them by using the "manage attachments" button, under the text box where you type in your post, and loading them from you computer to the forum server. Or you can go to a photo hosting site such as "photobucket" or other and upload you pictures to that site. Then you use the forum "VB image code" to insert your picture.
Code:
[img]web.location/photoname.here[/img]
The hosting sites generally have VB codes that you can easily cut and paste right into posts, and they often can resize your pics for you. if you upload to the forum server you will have to use some sort of photo editing software on your PC to size your pics to be more internet friendly. The bascic rules of thumb for all forum pictures is they be no bigger than 350K in size so as not to waste bandwith, and a format of no bigger than 1024x768 so you don't break the tables.