You can easily change your subscription plan through your iPhone or iPad settings. To do so, please follow these steps:
Open the "Settings" on your device.
Tap your "Apple ID" at the top.
Select "Subscriptions". If you don’t see "Subscriptions", select "iTunes & App Store" → tap your "Apple ID" → choose "View Apple ID" and sign in → scroll down and tap "Subscriptions".
Find and tap "Walking" app subscription.
Tap "See All Plans".
Select the plan that best suits your needs. Your subscription will update immediately according to the new plan.
If you decide to downgrade your subscription, the change will take effect at the end of your current billing period. You’ll continue to have full access to your current plan until that time, after which your subscription will renew at the lower price.
Apple typically doesn’t issue refunds for downgrades, but in some cases, you may be able to request one for a recent purchase within 14 days of the change. To check your eligibility or request a refund, it’s best to contact Apple Support directly for clarification.