Log into your account at https://system.gotsport.com/
Go to your "Account" tab. Right underneath your personal information, there is a section labeled "OPT OUT of Email Communications From:". If the checkbox next to the club name "UNCHECKED", that means you will receive email communications from the club. If the box is "CHECKED", you will not receive email communications from that club.
Scroll to the bottom and click "save".