It is recommended only to use the temporary domains: greatmockup.com and myallprowebtools.com when first setting up your account.
We highly recommend that you create a subdomain on your own website domain for hosting your AllProWebTools CRM. So instead of using: mycompany.greatmockup.com we recommend using your actual domain name (ie. example.com) like this: apwt.example.com
Setting this up is quite simple. Just login to your domain host (usually godaddy or wherever you bought your website name from) and create a new DNS entry of CNAME with the value of apwt that points to: apwt.allprowebtools-s2.com
Here is a link to the official instructions on how to do this with godaddy: link
Then just contact AllProWebTools support and let them know that you have updated your DNS. That is all!