You can see an example of a sticky ad on our demo site. Click on a post like this one and scroll. You'll see an image 'stick' to the sidebar as you scroll.
1. Install the plugin
We're using the Q2W3 plugin - so search for it within your Plugins section - then install and activate it.
2. Set the Options
Go to Appearance > Fixed Widget Options
Use the options outlined in the screenshot below. The key ones are the Margin Top which should be 110 - and the Stop ID which should be clear.
3. Upload an Image
Time to add an image via the 'Media' section. Upload one you'd like and then note its URL (path).
4. Add it to the Sidebar
Go to Appearance > Widgets - Sidebar
Drop in a Custom HTML widget into this widget area.
We're going to use a simple bit of html to display the image (replace this path with your own) and wrap it with a link.
<a href="#"> <img src="http://themedemo.createandcode.com/jefferson/wp-content/uploads/sites/39/2017/08/jefferson-ad-spot.jpg" alt="Jefferson Ad" /> </a>
You can replace the # symbol with a direct link to a page.
Make you tick 'Fixed widget' at the bottom!