How do I change the drop site for a member?

Customers & Partners / CSA Subscriptions 

Go to the member's subscription page, edit the drop site via the "DropOff"  drop-down menu, Save changes.

If you allow it, members can do this via their Member Dashboard. To allow for this setting go to Home / Settings / Option Settings  scroll down to "Subscriber Settings" and select "Change Drop Points or Delivery Day."