How I can cancel the purchase from Apple Store?

Apple Store or iTunes Store?

Review recent purchases at https://reportaproblem.apple.com/ or check your purchase history in iTunes and view your subscriptions. If you are the organizer of a family share check for purchases by other members.

See also If you see an unfamiliar iTunes Store or App Store charge on your bank, credit card, or debit statement - Apple Support and About payment card authorization holds in the iTunes Store - Apple Support.

If you cannot identify the payment then perhaps you are looking at a phishing email.

If there really have been purchases that you didn't authorize, or you've entered your Apple ID credentials at a fake Apple portal, see If you think your Apple ID has been compromised - Apple Support, change your Apple ID password, and if possible turn on Two-factor authentication for Apple ID - Apple Support.

See also Use Restrictions to prevent purchasing on your iPhone, iPad, or iPod touch - Apple Support.

• If there is no evidence of a charge on either your iTunes or bank/credit card accounts this is likely to be a phishing exercise which you should ignore.
  
• If there is a charge shown under your iTunes store account and it relates to misuse of your Apple ID then you need to start a conversation with iTunes Store support to get it cancelled and refunded, change your password, and enable two-factor authentication if at all possible.
  
• If it isn't connected to your own Apple ID but funds have gone from your bank or credit card account that purport to be from iTunes then the account has been compromised and you need to deal directly with your financial institution.

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Assuming that this is an actual purchase that you made and are now not happy with then use the https://reportaproblem.apple.com/ page to request a refund. Note however that in principle all completed sales are considered final and a refund will be at Apple's discretion.

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Visit View, change, or cancel your subscriptions - Apple Support. Typically apps with free trials set up an auto renewing subscription. You need to change the settings before it renews or you will be charged. See also About payment card authorization holds in the iTunes Store - Apple Support. It may be that an authorization hold was put on the account to make sure that you were good for the value of the subscription, then subsequently removed. Either way contact iTunes - Official Apple Support if you're not able to cancel the subscription or it appears that you've been incorrectly charged for what you took to be a free trial.

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