There are no dumb questions. We all learn by asking questions. As a retired teacher, I should know.
Here's how to illustrate a post with a picture:
1. Click the "Upload a File" button at the bottom of your new message.
2. Click the "Browse" button when it appears.
3. A file window from your computer will appear. Use it to navigate through your filing system to where your picture file is.
4. Select your image, then select the "Open" button. The file will upload.
5. A miniature version of your picture will appear below your message with two buttons, "Thumbnail" and "Full image".
6. Place your cursor where you want your picture to go within your text.
7. Select the "Full image" button and your picture will appear normally sized at the position you have chosen.
8. Complete your message, then select the "Post reply" button to post it with your picture to the forum.
Hope this helps!