Changing Account Directory Name?

Hi so I bought this Macbook off a friend and I have changed the main log in name to my name, but the home directory thing is named account2 and all I want to do is change it without messing anything up. Just rename it thats all.

Thanks in advance.

Pic of what I mean
https://www.dropbox.com/s/czxwvstwzvf1duu/Screen Shot 2013-01-24 at 18.21.13.png

Thanks, if thats the only way to do it I think ill just leave it! Dont fancy messing up.

Thanks anyway.