A system manual won't really help, as saving is different from game to game and not all of them offer the ability. What specific games are you trying to play?
For system save management once you've made some saves, press select on the bios boot screen. The top option is to view and delete individual save files, the middle option is to format the save ram (deleting everything and sometimes necessary if save ram is corrupted), and the bottom option is to go back to the boot screen.