If you'd like to limit the number of rewards an Advocate can get from the referral program, please use Fraud Settings. You can find them by clicking Menu at the top and clicking Fraud Settings. 



Scroll down to Additional Settings and change the 'Limit the # of Advocate Referral Incentive rewards each Advocate can get' to your desired number. You can set a limit on the number of rewards an Advocate can earn in total or within a 30-day period. This change will affect all the campaigns you have live for your site.