When you're ready to become a full member, able to view the contact information of more than the 2 no-risk ones you got by default, click on "Upgrade!" from the top menu.

You will then be taken to PayPal when you click on the payment button, and you'll fill out your billing information. When you've paid your contribution through them, your charity-of-choice will be given a portion of it, and you will be taken back here to Christian Housing, where you can continue to exchange contact information with other Christians.