Support
Email support@clubcardgolf.com. That is the address Apple App Review and players should use.
The iPhone app
Sign-in, scoring, the live leaderboard, joining a club-open tournament, and deleting your account all live in the app. Scoring works without a signal; scores upload when you are back online.
The organizer website
Clubs, tournaments, pairings and results are run at app.clubcardgolf.com.
Delete your account
In the iPhone app: Account → Delete my account. On the website: the profile circle → Security. Details are in the privacy policy.