When a timesheet is completed, members simply click the 'Submit timesheet' button. They can also add a comment for the approver.

Once a timesheet is submitted, time logs get the ‘Pending’ status (yellow border) and all Administrators and Managers from the same Team receive an email notification about a newly submitted timesheet.
If members are not assigned to Teams, all Administrators and Managers in the account get notified about a new submission.
All unsubmitted entries are marked with the blue border:

Team members can make edits to submitted hours if needed, and then simply submit the timesheet again. Once a time log is approved, the team member will not be able to edit it anymore. If you wish for them to edit a time log that was already approved, you need to reject it first.
Mobile app
Timesheets can also be submitted via the mobile app:
