Edit the hold, and click the trash can
To delete a hold, first click into the hold from your calendar. Then, on the right side of the hold module, you will see a pencil icon. Click this to edit your hold.
Once you are editing the hold, you will see a trash can icon appear. Click the trash can 
Select from the module if you want to delete only this hold, or other holds as well. Follow the buttons to delete the desired holds.
