Unfortunately you need to do it before your friend activates.
What does my friend need to do to redeem the referral?
Tell your friend they must redeem the offer (by entering their name and email address into the referral system) before they activate their service with Koodo.
Then your friend buys a phone or SIM card and activates on a postpaid rate plan.
After activation, your friend needs to log back into the referral system and provide their mobile phone number.