Time entries can be modified by going to HR > Time and Attendance and finding the locating the entry you'd like to modify.
Clicking on the entry will open an edit form, on the right side of the screen which will allow you to modify the time entry.
Make the necessary modifications to the time entry. When done, then click "Save and close".
Note: Only time entries in the Draft, Submitted or Rejected status can be modified. Once approved, time entries cannot be modified.
If you need to modify an approved timesheet, you will need to unapprove it first.