If you’ve forgot the password to your Ghost blog, you can always request to reset your password directly from your Ghost blog by following these steps.
Access the “Sign in” page of your blog
Navigate to the sign in page for your blog, located at yourblog.com/ghost/signin
Next, type in your email address and click on the "Forgot" link.
Check your email
An email will be sent to your admin user’s email address. This email will contain a link that you need to follow in order to reset your password.
Reset your password
After clicking on the link contained within the reset instructions, you will be directed to a page where you can reset your password. When you’ve finished typing in your new password, click “Reset Password” – this should redirect you to the main login screen again, to log into your blog with the newly created password.