To offer or get a ride, tap the destination in the left or right columns. Login with your Throng login or create your login when prompted. If you don't have the app already, get the Throng app for iPhone or Android, click the Settings button and tap "My login" to enter the login and password you chose earlier. Then check your alerts to see if anyone matches. Chat on Throng and get to where you need to go.
Be safe. Know who you're riding with! Create a profile or connect to your Facebook profile so people know who you are.