Whether you decide that you want to cap the number of affiliates in your referral program or you simply want to prevent new sign ups at a certain time as a marketing strategy, you're able to do this with Kickbooster at anytime without having to disable your referral program.
How to prevent new signups
Go to program's Settings
In General, go to Prevent new signups and click Yes
Important Reminder
When you have the feature to prevent new sign ups enabled, your referral program sign up page will have a message saying, 'This campaign is currently not accepting affiliates at this time'.