Got it.

Right click on "User Gallery" under your info on the right upper of your post.
Click "Open in new tab"
This takes you to the new tab
Find the picture you want to post, click and copy the "BB code" link under it.
Come back to THIS window/post
Click the "reply" button to make a new post
Paste the link into your new post.

You can go back and forth and do this for several pictures.
Submit post
Done