How will I be charged for my Rockmelon monthly subscription plan ?

You will be charged for your first monthly subscription though your Apple iTunes Account. You will then be charged monthly on this same date. The charge will be made to the card associated with your apple Account. To view and manage your subscription on your apple Account follow these steps:

Step 1: Go to Settings > [your name] > iTunes & App Store.

Step 2: Tap ‘Subscriptions’.

Step 3: Tap the subscription that you want to manage.

Step 4: Use the options to manage your subscription. You can choose a different subscription offering, or tap ‘Cancel Subscription’ to cancel your subscription. If you cancel, your subscription will stop at the end of the current billing cycle.

If you would like to review these steps on the apple website click on this link: https://support.apple.com/en-au/HT202039