how to change current domain url

[sunsain]

any body help?
my current xenforo url is : http://myworld4u.com/index.php
how to chanage this : http://myworld4u.com/community
one more problem : how to change then name XENFORO left of top side(up on home)

 

[Jake Bunce]

Please enter your forum name (sunsain) on this page so I know you are licensed:

http://xenforo.com/customers/forum-users