Disable the icloud

Welcome to the Apple Community. 

Go to Settings ➔ Apple ID(Top) ➔ Sign Out  (at the bottom of page)

Check the Apple official way to turn off the iCloud Activation Lock https://support.apple.com/en-in/HT201441

Only that doesn't actually say how to do it, but rather under what circumstances you would. 🤣🤣🤣