Enams, you post twice and you don't want to understand...
well, it is very easy:
you have a template which you use
you have a custom page which you store in the root of your zen-photo-installation for example
this page uses the same CSS-stylesheet and the same CSS-classes and CSS-Ids which you use in the template, foto-pages
so.
Now you open your template, for example index.php, look for the menue and add there a link to that custom page
or you enter a link to your custom page in any other of the template-pages which sit in the folder of the template which you activated
it is just plain HTML-integrating
check it out, but really: try before cry ;=)