You can set the administrator password using Web Config.
When the password policy is available, enter a password that meets the requirement.
You can make settings for the password policy by selecting the Product Security tab > Password Policy.
Access Web Config and select the Product Security tab > Change Administrator Password.
Enter a password to New Password and Confirm New Password.
If you want to change the password to new one, enter a current password.
Select OK.
To set or change the locked menu items, click Log in, and then enter the administrator password.
To delete the administrator password, click Product Security tab > Delete Administrator Password, and then enter the administrator password.