The navigation path between MainLogin and WRKSYSSTS is:
MainLogin -> IBM I Main Menu -> WRKSYSSTS
If you completed tutorial RAMP-ONE03: Navigate to Work with Active Jobs, RAMP already knows how to perform the navigation MainLogin to the IBM i Main Menu.
What it does not know yet is how to navigate from the IBM Menu to WRKSYSSTS.
Press F3 to go back to the MAIN menu.