It looks like you've already successfully set one up as a parked domain. Are you getting the default website page with the address http: // yoursite.tk/ cgi-sys/defaultwebpage.cgi? Then everything should be good. Just allow the system around 24 hours to sync up with the new domain, and then it'll work like it's supposed to. Be sure that when you check your site during this time, you clear your browser's cache first.
Edit: A whois search reveals that the nameservers are not x10hosting's nameservers, but they are .tk's nameservers. Please go change them to x10hosting's nameservers in order for the domain to work properly for your site.