How to Change Users Password
If you want to change users password on your child sites, go to: MainWP > Dashboard > Users > Manage tab. Locate the search box and type wanted user name and select your sites: After clicking Search Users button, list will appear. Check the check box next to the user you want to change password to: In top right corner you need to write a new password and click Update Password button: After that your user password will be changed: