The answer was given in response #2. This is not done within Muse, and basically cannot be done in Muse unless Muse starts writing .htaccess files. I doubt that they ever would give it such capability.
The .htaccess file is a text file located in the root of your web server, accessible with an FTP client such as Filezilla, and editable with a basic text editor. If there isn't a .htaccess file present, then you can easily create one and upload it to the root of the server.
Keep in mind that this only works on an Apache server.