To support a friend's ride, click Find a Dream Rider and click on your friend's name (or follow the link they sent you to their page).

Once you're there, click "SUPPORT MY RIDE"—it's a big button on the right hand side.

Be sure to click that from the rider's page, so that you're supporting your friend. (If you already made a donation and it didn't get credited properly, email [email protected], and she can fix it for you!)