How can I remove an iCloud account from the iPhone ?

Activation lock is a security protocol that can't be bypassed. Only the person it is locked to can unlock it.

If you bought this from someone and it came locked, try to get your money back, you will never be able to use the phone.

If your phone is Activation Locked - How to remove Activation Lock -

How to remove Activation Lock - Apple Support

The All Too Common SAD Reality of Buying a used phone -

https://discussions.apple.com/docs/DOC-250001038

Go to the settings, then iCloud ID, scroll down to the last, and Select Sign Off.

Is there something else you are facing, please share the details.

Sorry, but I can't understand your question. Could you please explain what your issue is?

Thanks