Apex domains cannot have CNAME records.
Question and response
Question
dig giow1070.siteground.us. NS
Answer
giow1070.siteground.us. 5 NS ns1.giow1070.siteground.us.
giow1070.siteground.us. 5 NS ns2.giow1070.siteground.us.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0