There are two ways to do this.
1. You can upload pics directly into a post.
2. You can upload pics into an album, and then paste code into a post to show the pics in the post.
Item #1 is probably easier. I'll give you full instructions for Item #1.
How To Upload Pictures Directly Into a Post
1. Click "Go Advanced" under "Quick Reply
2. Type your message into the box, then click "Manage Attachments."
3. A new window will open. Click "Choose File."
4. This will open an Explorer window on your screen. Navigate to the folder where your photos are. Select the first photo you want to upload, and click "Open."
5. Select the next "Choose File" button, and choose your next pic. You can queue up to six photos at a time. When you have finished selecting photos, click "Upload."
6. This gets you back to your post. It looks like nothing is happening, until you click "Preview Post." This will open a window above your post, that shows what your post will look like, with photos.
7. You can continue to edit your post--in the lower window, not in the "Preview" window--and you can continue to click "Preview Post" to check on your changes. Once you are happy, click "Submit Reply," and you are done.
A somewhat silly (but necessary) note:
The bulletin board loves to post pictures sideways and upside down. In a nutshell, the Forum software doesn't play nice with the photo rotation information in the header of some photos.
Regardless, you can avoid the problem. Before you upload your photos, open each one, in turn, in Paint. Make sure that it is oriented with the top up and the bottom down. Then save it under a new name. (Yes, this means that you probably won't be changing the pic at all--all you are doing is saving it under a new name.) When you do this, Paint overwrites the photo rotation information in the header in a manner that the Forum software recognizes. Upload the saved pics, not the original pics.
And a final note:
You can also upload photos into a photo album, then copy and paste BB code into your posts to insert the photos into your post. But we'll talk about that another time.