Selecting the Wages button on the Current Pay window opens the Wages window. Only wage lines with a value will print out on Payslips. If wage lines have been set up in the Standard Pay they will have been copied over. Here you can change the hours if they are different from the default. You can also change the Rate Type and/or Cost Centre.
If you want to add a new Wage line click Add or press F4 and follow the same steps you performed when setting up the Standard Pay.
When you have entered the hours, click Save or press F10 to save your changes and return to the Current Pay window, or press the page down key to move to the Allowances tab.