menu direction rtl css

i need to change the direction of the menu of my site web
from LTR to RTL.

the site is build with wordpress theme REALTO

i read un the web that i need to put float:right;
in the main section menu of the css but not work

here is the link of my site :

you can view all the style css with firebug

thank you very much
i wait for you response

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