Ministry Leaders* can edit the service plan through the Admin tab in the Web Terminal. From the schedule, a Ministry Leader can click on the link for the date and time of the service to be edited.
This will bring them to the service plan view for that service. From here, the Ministry Leader will be able to edit the service plan just like an administrator of MSP.
*For licenses purchased after December 2015, Ministry Leaders are only available in the Plus Edition of MSP.