In laymans words,First the domain "www.amirsadzalli.info" should be setup so that when queried, it should come straight to X10hosting servers.As you are on a shared hosting, this means that after the above domain request has come to the x10 server, it should then get to your particular hosting account.So setting a domain is a two step procedure.Very easy though.
For the first part:
Watch this
video
The required nameservers for your case with GoDaddy are
ns1.x10hosting.com
ns2.x10hosting.com
Then through your cPanel , set up a addon domain/parked domain with the required settings
Watch this..And then you are done!!
Good Luck.