You can have here anything you want.
Some explanations about how to use your gallery, or what kind of pictures can be found,
or how to upload photos and in what albums, or anything you want.
How to do this ?
First, edit the file mypage.php and add the HTML code you want. Save it.
Last, go to your admin section, click on Config, and set the size for the popup page.
If you don't set any size, the ? button will not be dispayed.