You need Time permission to view and edit the roster and time clocks.
You'll need Salary permission to be able to view pay rates. If you don't have access to this , ask someone with Managers permission to update your user permissions.
Pay rate adjustments will only affect future rostered shifts & time clocks. They will not adjust any shifts rostered or worked prior to the date the pay rate was adjusted. Please note, this includes shifts rostered in future weeks that were created before the pay rate was adjusted. I.e. if you update a pay rate on Tuesday, and the employee is already rostered for Thursday & Friday of that week, you'll need to open & re-save the shift in order for the rostered shift to calculate at the new rate. Any shifts that are yet to be added to the roster or timeclock feature will automatically be added at the new rate once they're created.