How to Change the WordPress User’s Display Name
You can change the display name of your WordPress account, which shows on WordPress posts and comments. Log in to the WordPress dashboard. From the Dashboard menu, go to Users and click on Profile. Locate Nickname and enter your new name. From the Display name publicly as, choose your newly added nickname from the drop-down menu. Scroll down to the bottom of the page and click on Update Profile.
How to Change the Password of a WordPress Account
You can easily change the password if you have access to your WordPress account. Log in to the WordPress dashboard. From the Dashboard menu, go to Users and click on Profile. Scroll down to Account Management and click on Set New Password. Copy the password to a safe place and click on Update Profile to change your password.