To change the password for the user associated with your blog, follow the guide below.
Log in to your admin area
The first step is to log in to your Ghost admin area, where you can control all of your blog’s content and settings. You can find your blog admin area by going to yourblog.com/ghost and entering your login credentials.
Click “Team” from the admin navigation menu
This will direct you to the “User Management” area.
Click on the User you’d like to edit
Find the user you want to change the password for.
Change your password
Towards the bottom of the user settings screen, you can enter your old blog user password, and create your new blog user password. When you’ve finished, click on the red “Change Password” button to save your changes.