You can use any domain you want to access your Models by Toggles installation.
This is a little technical but easy enough for somebody with some DNS experience to set-up. Contact your IT administrator.
Your custom web address (URL) should be setup as a CName record pointing to [yoursubdomain].mbtapp.com on your DNS (domain name server). (You usually do this with the company you registered your domain name with eg. GoDaddy.com)
And verify the CName record is working.