As well as using magic spells you can also pray to the gods of RuneScape to give you an advantage. To view the available prayers point at the spell book item at the top of the screen, and click on the 'prayers' tab to show the list. The list of spells available is colour coded to indicate which prayers you can use. If the name appears in black your prayer level is not yet high enough. If the name appears in white the prayer is available to use.