How to align part of menu right

Hi there..

In my search of inlightment I found this very nice forum. As I searched for my problem I found a post with the same problem as I have:
http://forum.bytesforall.com/showthr...ght=menu+align

But the thread is now closed, so I will try to see if I can be as lucky as loto, and get some help :-)

So my problem is I can't get my last entry in the menu to align to the right.

What I have done is:
found the stylesheet (style.css) and inserted:
#menu-item-77 {
float: right;
}

But noting happens.

Therefor my questions is:
-Is the style.css file the correct file to edit?
-As I am linking the menu to another site (joomla) I am not sure that I have det correct id for the menu, is there a good way to find the id?

Best Regards