The nameservers changes will take about 24 to 48 hours to come into effect. Please wait till that time. if still after that you have got problem, post a ticket in support.x10hosting.com
We are trying to sort out the problems as soon as possible.
Please visit and read this thread
http://forums.x10hosting.com/news-announcements/92380-changes-information.html
Sorry for the delay. We are experiencing some problem in account creation at the moment due to the recent server changes and upgradations. Your account will be active soon once the problem is sorted out.