Each domain gets only one database. This means that you can not add or delete a database from your domain. Some script instructions may ask you to create a separate database. You will not be able to do so. However, you may still be able to use the script by simply using your existing database in the script configuration. Also be sure that the table prefix is different from other table prefixes that may already be in your database. You can view all the tables in your database by using phpMyAdmin.