If you've the option to point it by nameservers (ns), that would be the best way. If you're able to do this, point it to: ns1.x10hosting.com & ns2.x10hosting.com
If you are not able to set ns, but are allowed to set A records, you need to point them to: 67.228.162.200. This is the Shared IP Address that your account uses (it's one of Lotus IP Addresses).