My site was made in Muse and is hosted with Business Catalyst. I now want to submit a sitemap to Google using the Google webmaster tools. I can create a sitemap using third party tools like XML Sitemaps Generator. But now I'm supposed to upload the file to the "root directory." How do I do this with this scenario when I am publishing directly from muse?
You can login to your admin console of your site, for example you own domain.com, then you need to go to domain.com/admin and log in with your ID & password. Then you can click on the "Help & Support" link on the top right corner and in the opening page scroll to the bottom where you will find the "FTP Configuration" settings.
More helpful details in the KB related to this matter from BC: http://kb.worldsecuresystems.com/153/bc_153.html
Make sure to first log in into the admin console and just then through FTP.