In order to point your domain to Wix.com, you have to upgrade to Wix.com premium plan. For more information, kindly refer to here
There are 2 ways to connect your domain to Wix.
First, change the nameserver to Wix.com
NS1.WIX.COM (IP address 126.96.36.199)
NS2.WIX.COM (IP address 188.8.131.52)
Second, your domain's nameserver is point to our server, change the A record to Wix server's IP. To get the IP, you may need to login to Wix administrator dashboard.
For more detail information, kindly access here
Once get the IP, login to HELM control panel. Go to DNS Zone Editor, from bottom, click "Add New" button.
Select Record Type which is A (Host Record).