How to remove Activation Lock?

If you're referring to Apple's service, it's free if you're able to provide the documentation and not available otherwise.

If you're referring to a non-Apple one, it shouldn't be used; they either do nothing or route all the data from it through their own servers.

If you're referring to the person you got it from, they shouldn't charge extra to remove the lock.

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Check your web browser autofill entries, the Keychain, and other records, or use Apple's iForgot service, or contact their Account Security team, or submit a request as described in the Related Article above.

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Nobody on these boards can; most of them are other customers, not Apple employees. Pick an option from those described above.

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Try recovering it as described above.

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