You have to download the MyJTA app. It's actually a little cheaper to buy passes on line.
You would have to Download on the Google Play Store Or App Store ( Android or iPhone). JTA is the name of it. Once it has been downloaded you would have too add a Debit or Credit Card to your account. To Add it you would need to press the three bars that is in the top right hand corner. You can purchase any ticket you need. If this doesn't help contact JTA customer service.
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