handyman06,
That is where an attachment called an auto prime tools fits. It is a tube that is filled with primers. They are fed one at a time into the regular priming mechanism that is with the press when it is purchased. The auto priming tool is an option. Difficult to explain, but you could see one in any of the reloading supply catalogues or on the RCBS website. They are O.K. but a bit tricky to get setup correctly so the primer feeds into the seating tool that comes with the press. I just use the Lee Auto Prime and go that route. Good-luck...BCB