The below link is a set of instructions on how to create a parent account:
https://help.rfu.com/support/solutions/articles/15000031982-how-do-i-create-an-account

The link below will direct you to the link to the Clubs page where you can set up an account and have it automatically linked:
Kings GMS Dashboard

Once this is done, please check your emails for a verification code that has been sent to you. Please click on the link to confirm your email.

Then, add your child by following the instructions linked below:
https://help.rfu.com/support/solutions/articles/15000048491-how-to-add-a-family-member

Finally, affiliate your child with the club using the instructions linked below:
https://help.rfu.com/support/solutions/articles/15000031972-age-grade-player-affiliation-for-a-parent-guardian