You can send them by:

With PayPal or with a card, clicking here

By Mail, FedEx or UPS
You must send it to:
River Church: P.O. Box 8400, Anaheim, CA 92812 USA

From all over the world
In the USA: 714.750.8400
From others countries: 001.714.750.8400

Only in the United States
By Text message
Download the instructions here