I signed up for your service but I wasn't able to see my assigned subdomain/URL in my control panel.

Upon creation of your account we have not assigned/created any subdomain. You should create one your-self i.e. yourname.domain.com from within cpanel, Subdomain Manager section.

Once you create a subdomain the system will automatically create a corresponding folder inside your File Manager menu with the same subdomain name. You should upload your website files in this directory.