On the employee's timesheet detail page click Edit on the row:

• For an existing timecard, the Manage Timecard window opens; adjust Clock-in → Clock-out, the Role and the breaks, then Save Timecard. If the timecard belongs to a scheduled shift you also see Linked shift with the planned hours and an Edit Shift button.
• For a No-Show row, the same window opens pre-filled with the shift's planned times; enter the real times and save to create the timecard. Note that in this case the shift's scheduled times are updated to match what you enter.

Editing and re-saving a timecard also refreshes its hourly rate to the employee's current rate for that role.