Under My Tryps, click the Collect All button and select if you were the Driver or Passenger. Your selection will be applied to all outstanding Tryps that have been recorded in your account.
To select individual Tryps for Driver and/or Passenger, click the Select button and choose the Tryps you want to assign to Passenger. There will be a Green circle with a check mark which indicates you selected that Tryp. You can then return to the top of your Tryps and click the Collect All button. You can now click the Collect All button again, select Driver and collect the remainder of your Tryps.