Apex domains cannot have CNAME records.
Question and response
Question
dig helps7.com. NS
Answer
helps7.com. 3 NS ns-1834.awsdns-37.co.uk.
helps7.com. 3 NS ns-969.awsdns-57.net.
helps7.com. 3 NS ns-1982.awsdns-55.co.uk.
helps7.com. 3 NS ns-1843.awsdns-38.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0