1) register tabanart.com if you have not yet done so (it doesn't matter where you register it)
2) log into
http://x10hosting.com/control, click "Hosting", and then choose the option to modify your main domain
3) change your main domain to tabanart.com; note that these requests are queued so the operation will not happen instantly. Please be patient as it may take a while for the change to get processed
4) in the meantime, change the nameservers for tabanart.com at your domain registrar to ns1.x10hosting.com and ns2.x10hosting.com. It is recommended that you do this at the same time as step 3, as there is also a delay for DNS changes to make its way through the internet (normally around 1 hour, but 48 hours isn't unheard of).