Select Sign-up.
![select Sign-up](https://media.screensteps.com/image_assets/assets/004/952/678/original/07fda3c3-6de1-416e-979c-fe22a4c129f6.png)
Select Sign-up from the site's Tool Menu.
Select the time slot to lock or cancel.
- Select the timeslot.
- Beneath the timeslot, select either Lock or Cancel.
Note that participants can be moved to another time slot using the edit buttons beside individual entries.
Select OK.
![select OK](https://media.screensteps.com/image_assets/assets/004/952/685/original/947df333-e718-4a79-af3e-b7a59639d634.png)
Select OK to confirm the locking or deletion of the slot.