here is how you can edit the footer or the header for a gallery, in Tripod.
1. First, find the template that builds your gallery. You can find it in Layouts > Gallery post http://i.imgur.com/pMLySvV.png
2. Now, that you know your template, go in Templates and try to locate this template. You might have to find it first http://i.imgur.com/F2NtwpH.png .
3. Edit the template http://i.imgur.com/UYmb7UE.png
4. Now, you can check your gallery http://i.imgur.com/qpe5r8u.jpg
PS: the alignment of the elements can be modified using the columns blocks, and element's settings http://i.imgur.com/qPJ9P8E.png
Wish you a very great day!