change email password iph

Sign in to your Email provider's website and change it there per the own instructions. Once that is done, you can go to Settings->Mail->Accounts and change the password for the specific account there. Some accounts such as hotmail, may require you to remove the account and add it again with the new password.

If using iCloud, see here: link-> Change your Apple ID password - Apple Support

By email Password, I presume you are referring to the Apple ID password.

If you are the owner or the owner has shared all information with you then to open Activation Lock:- If it is Activation locked, read here --> Turn off Activation Lock - Apple Support Activation Lock for iPhone, iPad, and iPod touch - Apple Support

Learn how to remove a device from a previous owner's account.

If you are not the owner and do not have the Apple ID and Password then there is no way that you can get into this iPhone unless the original owner shares the Apple ID and password with you. If you are lucky you can get into this iPhone if they (owner) accidentally remove the device from their Apple ID.

iCloud uses Apple ID credentials.

If you do not remember the Apple ID Password then follow the steps given in this Apple Article -> If you forgot your Apple ID password - Apple Support

If you do not remember the Apple ID then follow the steps given in this Apple Article -> If you forgot your Apple ID - Apple Support