Apex domains cannot have CNAME records.
Question and response
Question
dig wwwmycheckfree.com. NS
Answer
wwwmycheckfree.com. 5 NS ns2.wwwmycheckfree.com.
wwwmycheckfree.com. 5 NS ns1.wwwmycheckfree.com.
Authority
The response has no authority records.
Additional
ns1.wwwmycheckfree.com. 5 A 86.111.190.245
ns2.wwwmycheckfree.com. 5 A 38.90.142.144
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0