There are two settings that control the ability to use the Payment Calendar.  First, the User must have security rights to it.  Second, the User either needs to be set as an Unrestricted User or, if set to Restricted, needs to have proxy rights to other Timekeepers.  Go into Manage Users, call up the appropriate User record and remove the check mark from the Restricted option on the Administration Tab.  If you do not want to remove the Restricted option, you will need to assign Proxy Rights. The User must exit Orion and re-enter it after these changes are made.