I installed WordPress through the auto install script. I tried going to my site/wp-activate, but it still brought me to the login page. I never created a username/password. Any idea where I can find it?
You can reset the wordpress admin password via phpMyAdmin, see http://codex.wordpress.org/Resetting_Your_Password#Through_phpMyAdmin for a guide. Please note that you following these steps is on your own, and we cannot provide any official support in case the steps do not work or mess up your site. If you do not feel comfortable with this, then consider reinstalling Wordpress via softaculous.