Each TNG eWallet only allows up to 15 cards. You can remove any one of your cards by performing the steps listed below. You can always link your card back into your TNG eWallet after it has been removed.
Step 1: Tap on the Transport icon on the home screen and tap on the TNG Card icon.
Step 2: Select the card that you would like to remove
Step 3: Tap on the three dot Menu on the top right corner.
Step 4: Tap Remove Card
Step 5: Choose Remove