How do I enable mod_rewrite?
mod_rewrite is an Apache module, so it requires Apache. If you’re on a shared web host, you’ll have to e-mail them and ask for it. Most large web hosts that use Apache will have it enabled already, but yours may not, it’s not uncommon. Secondly, you need to edit the .htaccess file in your zenphoto installation and make sure the RewriteBase line is correct. It should be the URL to your zenphoto after the domain name. For example, the RewriteBase for http://www.zenphoto.org/zenphoto looks like RewriteBase /zenphoto.With version 1.1.3 the setup program will have checked (and possibly fixed) your RewriteBase. Third, you need to make sure mod_rewrite is enabled in your admin options/gallery configuratrion tab.