You create a CNAME record with your domain host, not with Google. See above for instructions specific to your domain host. If your host isn't listed there, follow the general instructions, below.

If you need assistance, do email support@axon.com.sg

Host Name/Alias Value/Destination
Your URL prefix 
Example: mail

    Once you do this, your CNAME record points to Google. (Note, however, that changes to your DNS settings can take up to 24 hours to propagate throughout the Internet.) You can check the status of your CNAME record, as described below.