Step 1: Start the CURRENT application on your phone.
Make sure that you have logged in to your user.
* If you are not logged in to your user, you can do so by clicking the "Log in" button on the bottom right.
Step 2: Go into Settings
On the bottom right of your screen, there will be a button called "Settings" with an icon of a cogwheel. Proceed with clicking on "Settings".
Step 3: Payment
Once you go into settings, you will now see that there's a an icon of a card saying "Payment" on the 4th line from the top. Proceed with clicking on "Payment".
Step 4: Add a payment method
You will now want to proceed with clicking on "Add a payment method" and follow the necessary steps to register a Card of your choice or PayPal account.
If you have a registered payment method from before, this is also where you have the option to see it. It can for example be a payment method that is active, but also one that is expired.