How to change start date that is in the future?

1. Go to the member's profile
2. Select the Membership tab
3. Select 'Edit' and choose the new start date from the drop down. 
4. Click Confirm
5. Dates will be adjusted for the new start date

How to change start date from today to the future?

To move a start date from today to the future, pause the account until the new start date. 

To learn more on Pausing Memberships, check out this article