adding and add to the side bar

Hi , I know this is a simple question how do you add a addsesne add the the side bar ?

i found this sponsor slidshow widget
https://kolja.galerie-neander.de/plugins/#sponsors-slideshow-widget

and was wondering if i could use smart adds and isnert a javscript snippet to display a nice large image from addsense

any help or links to plugins very welcome tx guys