Simply put, do a password reset for the email in question. 

You are receiving this message because you had a clubhouse reservation within the past 2 years that was uploaded into the reservation system. Once you login, you’ll be able to view your past reservation and make future appointments.

See video below.

Simply make a new reservation for the clubhouse and the system will automatically detect if an account already exists. If the email on file hasn’t been used to populate a previous clubhouse reservation, then it will automatically prompt you to create an account and password. 

To make a new reservation – visit https://mkvhoa.com/clubhouse-facility/