I am trying to set up a subscription that will be an upgrade. so the member will have access to content at a faster pace. When I go to add the subscription to that member I see 2 option on edit members: 1st one is subscription and the 2nd one is membership level. When I try to add a subscription it does only give me the ability to add levels. so basically both options lead to the same thing. How can I add a whole subscription?