I think you want the Token Transit app. You can buy tickets, transfer tickets and passes on there. Activate the ticket or pass and show it to the driver to board the bus. Be aware that you must buy the one you need and drivers and CU are not responsible for if you buy the wrong one and can't refund you.
You're going to have to be more specific. If you're talking about having the app on your phone and showing your ticket you just keep showing the same ticket until it times out. If you're talking about transferring bought tickets. You can't.
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