...
At the end of a month period when you have completed the required workload and logged time, you can submit your timesheet to a single or multiple approvers, typically your Direct Manager or Project/Product Manager. Until you submit your timesheet the period says ready to submit.
...
To submit your timesheet for review:
Select Monthly view in the Period Selector
Click Submit Button
Select a an Approver from the drop-down list. Approvers are people who have been enabled to be such in the Timescale Setting page Only people with Jira Administrate permission can become such. You can make people such by changing their role to Site Administrator or Trusted Users.
Click Submit. The period status changes to submitted
...