No, you didn't. Instead of importing slider, you imported demo content several times and that's why all menu items and widgets are duplicate. We suggest to use WP Reset to clear whole Wordpress (yours wp will be as clear as after first installation) and after that, watch this video because looks like reading documentation is too difficult for you. But please watch it carefully because what you already wrote above is not true and the explanation we gave you, works on 10000%!
Comments
please take a look at http://forum.muffingroup.com/betheme/discussion/15/how-to-import-revolution-slider-into-be-theme where we explained how to import pre-made slides into layouts.
Thanks!