The domain change has taken place however Dot.TK is reporting your domain is invalid.
http://www.dot.tk/en/pageA50.html
When you attempt to whois ftcl.whsr.tk, it says it's an invalid one. If you attempt whsr.tk it works - my guess is they either don't support subdomains, or you actually have to set it up as a subdomain after making your main domain the whsr.
That said, if you do not own whsr.tk, you'll have to go register a different one at
www.dot.tk - we don't actually register the domains you're trying to use, you have to have them set up to work with us first.