If your timesheet is closed, you need to ask your manager to re-open your timesheet. You can read below how you do it.
If only one field is locked, you probably have several time registrations for the same tasks. If you change to the detailed timesheet, you can edit the single registrations from there:
If you need to re-open a timesheet for an employee, you need to go to the Approve time page. Here you select the period you wish to re-open in the data range, and then click the employee in the list to the left. Your period does not need to match the same interval as the employee has submitted time for.
The employee will be marked with green, if the period is closed. Hereafter, you will see the Re-open button in the detailed overview, where you can re-open the period, which is registered under Comments and actions. If the marking is yellow, it means that not all registrations are approved. Here you will be able to reject the period, which also re-opens the timesheets.
You can read more about approval in TimeLog in our Help Center.