In PT3 click Database --> Database Management, then click on the database you want to remove and click "Delete". NOTE: You cannot undo this action once you have done it. So make sure you really want to delete this database before you do so.
Will this delete it from PT3 but I mean delete it not just take it off the list like it says in PT2, and how do you delete it from PT2 but not just out of the list I wanted deleted from my computer. Thanks
The other option is to use pgadmin. Just select the DB, right-click, and "delete/drop". PT2 (or 3) will still have an entry that you should get rid of.