After installation and upload few photo and then log out. when trying to go back to main page the Admin tab option is missing. Using firefox and internet explorer. How can I log back into admin to post more picture.

The link to the back end (assuming you have mod_rewrite enabled) is [i][/i]/admin or the full link is [i][/i]/zp-core/admin.php.

It is the full link gallery/zp-core/admin.php