Due to incompatibility with our systems, at this time we do not support sites running in a subfolder. We do offer support for subdomains as shown below. Many people use this method successfully with their sites.

For reference having a site in a subfolder would look like this, which we do NOT support:
http://www.domain.com/some-site/

We do support subdomains which would look like what you see below:
http://some-site.domain.com/