Correcting an omitted referral

[#1]

I referred a friend who has since signed up. Unfortunately he omitted to refer o me during his sign up process. Is there a way he can now correct this please?
Neither he nor I can find anything in the member centre. My current referrals show one awaiting sign up.
Thank you

[#2]

There is no documented way to do this....
Both raise a ticket on their own account informing PN of who the referral value should be allocated to and mentioning the name of the other party involved.