Logging into your website is not something that is controlled or determined by the Music Maker theme. It is controlled by your website host and WordPress installation on your web host server.
We have no knowledge of your site URL or login page information because you selected all this on your own.
If you forgot your password it is suggested you go to your site login page at your domain name and reset your password. Which will look like . Click the Lost your password? and reset your password.
Don’t Know Where Your Site Is?
If you don’t know where your website location is, it is suggested you contact your website host to ask for information on how to access your website and WordPress login page if you already set up WordPress on the server.
Site Doesn’t Exist?
Contact your website host and ask for help with accessing your website.
If you don’t have a website host, please check out What you need to use the Music Maker WordPress theme?