Okay, if you look at the image below, you'll see a button for "Filename" in the "Upload attachment" section that says Choose File. Click the button and navigate to the image that's on your computer that you want to upload and hit the next button that says "Add the file". You can add a File comment if you want. Once you've done that, your file will upload to the site's server. Once that's done another section will pop up that says Posted attachments, and it should show the file you uploaded. If you loaded the wrong image or for some reason you didn't want to add that file, you can always hit the button that says "Delete file". After you've added all the pictures and edited your reply in the "Post a reply" section, then hit "Submit". All of the text you've added and the images you uploaded should show up in the post.
Another way is to use an image server website such as the one I use called "Image Shack". It's free to have an account and after you've loaded your images on their server, you can select all the images you'd like to post and click on the command that says "Get Code For Forums".
It will open up a window that gives a url for thumbnails of all the selected images. Once you've selected the codes you can say copy and then paste the codes into the "Post a reply" section of our website. Thumbnails will appear in the post, and once anyone clicks on the thumbnails, it will automatically take them to the Image Shack website and display the image. It's usually easier to use the second method when you have a lot of images to post.
I hope that gives you some idea of how to post up images. If it all sounds too fuzzy, give me a call and I'll do my best to walk you through the process.
Good Luck!
Sabrina