If another coach or member is helping with your Planning, make sure to give them admin status. Go your Gym profile drop down and select Launch Admin Console.
Once you're in the Admin Console, select "Members" on the left hand side of the page followed by "Manage". Search for the member's name and give them the admin role.
Additional admins will have all of the gym subscription holder's capabilities, including the ability to create workouts and Plan them as WODs for your members. They will not have the ability to manage the gym's subscription.