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seek help on x-trader

Hi all! after trading forex for a few years,
I decided to start with futures,
the broker is offering X-trader wich has been recommended to me,
and Im told it's the best platform,
but I have never used it before,
it has a ladder and look really nice,
but what I don't understand is how to close out trades?
I know how to buy and sell but how exactly do you close trades? LOL
I serched through X-help section without finding anything on the matter,
if someone using x-trader would be so kind to please explain
or point me to a tutorial of some kind.
thanks in advance