When logged into phpmyadmin as da_admin or root, click on the "Privileges" link in the main right frame.
You should be presented with a list of all the users that phpMyAdmin has access to. Edit the user you want to give access to the additional databases for.
On that page you should find a section called something like Database-specific privileges
There you can select the database you want the user to have control over from the drop-down menu as well as add, edit, or delete existing privileges.