After you create your initial myvip.co account, you can link it to your game account that is associated with Facebook or Apple. 

To do so, just click on the "Link your Account" button in the upper righthand corner.

This will bring up the list of all games. Select the one you play the most and you consider your primary account which has an active Facebook or Apple account. 

When you select your preferred login method, you'll be asked to login with that service. It is important to verify beforehand that you're using your preferred account as the link is permanent. This means that if you use an old or alternate account, that will become the primary one linked to myVIP.co. 

Once you sign in, your accounts will be successfully linked!