help with positioning

I am fairly new to doing some custom coding. I’m having trouble getting the widgets to show up in the area that I want them to. The theme I am using (Nirvana) refers to the area as right-widget-area but when I use the code that I think I should be using, it doesn’t appear in that area.

https://ww.wp.xz.cn/plugins/amr-shortcode-any-widget/