To find your referral link:
1. Log in to your coins.ph account.
2. Click on your email address on the lefthand navigation and Choose "Earn Rewards".
3. Click the "Referrals" tab or you can also go directly to https://coins.ph/rewards/referrals.
Here's how the page looks:
Please note that the link given above is only a sample, and referral links are unique to each account.