Jesse has you on the right track. First you need an image host. So upload your images to that host. Then you'll need the URL which points to each picture. Once you have that, jump on here. I'm sure you'll be starting a new thread, so open the correct forum (Revo Talk) and click the "New Thread" button. To add your pictures to your post, click on the "Add Image" button which looks like a little framed picture on the toolbar. Then just put in the URL of one of the pics. Click ok. Then do the same for each other pic you want to post. Once you're done, just submit the thread and it should work fine.
***Friendly reminder: please limit the size of each picture to no more than 640x480 pixels. Helps keep the thread loading faster.***