A Non Renewal is a member who was paid up last year but has been marked as a non Renewal for this season.
A member can be marked as a non renewal as follows
Via Self Care - Click on the Stop Sending me this Reminder link in their weekly renewal reminder email and select the option stating they do not intend to renew their memebrship.
By the Club Admin as detailed here
View a list of non renewals for your club memebrship
Login to the Clubzap.com/signin Admin portal
Go to Memebrship -> Members
Select the Filter and under Payment status select Non renewal
Click Apply