To make a pay run, make sure that you have approved the timesheet for each employee that worked during that period.
Go to Run Payroll.
Click on New Pay Run.
Select the pay period.
Ensure you have the box ticked that says "I'd like to create a pay run based on these timesheets."
Click on Let's Start.
The hours from the timesheet will automatically be added to the Ordinary work hours.
Proceed with the pay run as normal.