Trouble getting the ww.wp.xz.cn

[Moved from Your WordPress which is NOT a support forum]

Actually I have my blog (www.hopelaye.com), but I think that I opened it under a wordpress.com account because I can’t get any pluggins (like google analytics) or the “extension” on the menu.

I read that ww.wp.xz.cn is the better way to personalize my blog, so how can I change to wordpress.com to ww.wp.xz.cn without losing anything ?

Will I keep the same url (www.hopelaye.com)? Or the new one will be http://www.hopelaye.org?
And do I need to pay other fees for changing wordpress.com to ww.wp.xz.cn?

Thanks for helping me.