If you're seeing a blank white screen when you access your Contact Reach Whitelabel/CNAME URL, most likely you have missed the directory or extension "/app/login" after contactreach.co when setting it up before. So for example, if your CNAME or Whitelabel domain is app.mydomain.co, you should enter app.mydomain.co/app/login.
If you haven't set up the CNAME Domain or Whitelabel of your Contact Reach account, you can follow this training: http://link.mylocalagency.co/cr-cname