There are a couple ways to post photos.

The easiest way is to attach the photo(s) to your post. The photos will be uploaded to the forum, and displayed on your post. You can do this be clicking the "Browse" Button on the post form, and choosing your files. Note that the forum will display the photos as uploaded, so they may not fit quite right. In that case you will want to use a photo editor on your computer to change the size and/or aspect ratio of the photo, so it displays better before attaching it.

The other way is a bit more advanced, but nice if you already have photos uploaded to a web page somewhere. You can reference photos on other pages using the "Insert Image" button in the message toolbar, and typing the web address (must be an https:// site) that directly links to the photo you want to post in between the image tags that get added when you click the button.

When you click POST MESSAGE it will download with your message.