Starting on the home screen of ODIN PASS tap the blue "manage" button under the 'Subscription' tab.
This will display an outline of your existing Transport pass including the price, what services are included as well as it's starting and expiration date. Tap "View Pass" for a more detailed overview.
Tap the 'Renew pass for next month' button to renew your pass. Tap 'Confirm' on the pop-up confirmation screen to proceed to checkout.
Finally, tap the 'Purchase' button to renew your transport pass.
Please make sure to leave up to 15 minutes after purchase for your pass to become active.