Cant get "Slide In" appear on my site...

I want to use a "Slide In" , and show it permanently on my site with a custom menu in it...

I enabled widgets, put my menu in the widget, created a Slide in with that widget. I tried also using "wp_footer" as injection hook, but no effect. The Slide IN will not appear.

Tried a loooot of time ... If someone knows what to do I would be very glad.

I also grant access if someone can take a look it would be amazing!