Chat With Support and reference this article. 
Please advise the following in your case notes:
  • The desired site's name (with the purchased domain name)
  • The original Kintera url
  • Your log in name (no password needed)
Our Network Operations Center can create a CNAME for you.  It will resemble something like  Only one is needed for your account.  As a result, if you have previously updated your DNS with a Blackbaud CNAME, please advised it in the case notes also. 

Once the CNAME is created, you will need to update your DNS setting with the new CNAME and the A record.  Then, you can create a redirect or mask, if needed. 

Please allow 4-7 business days for the CNAME request to be completed.