mediteo premium is an in-app subscription which is managed by Apple or Google. The subscription will automatically be renewed unless it is cancelled.

Buy:

Profile symbol (top left) → Subscriptions → mediteo premium → Subscribe now (or test it, in case you have not yet claimed the 2-week trial period)

Manage:

Profile symbol (top left) → Subscriptions → mediteo premium → Manage plan → Change plan

Cancel:

iOS: App Store → Account icon (top right) → Subscriptions → mediteo → Switch or cancel subscription here
Android: Play Store → Account Icon (top right) → Payments and subscriptions → Subscriptions → mediteo → Switch or cancel subscription here

Further information about the cancellation:

• Cancellation must be made up to 24h before the current subscription period expires.
• Cancellation by means of a written statement is not possible due to technical reasons; the cancellation must be made on the App Store or on Google Play.
• Simply uninstalling the app does not result in cancellation: the subscription must still be cancelled on the App Store or on Google Play.

You can find further information on Apple (https://support.apple.com/en-gb/HT202023) and Google (https://support.google.com/googleplay/answer/1061913?hl=en).