Linking the featured image to a specific page

Hi Folks,

The Posts In Sidebar widget allows me to link the title to any URL, but how can I do the same for the featured image? Currently the image links to the single post that the image is featured in. I want the image to link to a specific page.

I know in WP Dashboard > Media I can link the image anywhere, but I want whatever image is the featured image in Posts In Sidebar to link to a specific page.

Notice how the title ‘New Inventory’ links to the Inventory page, but the associated image links to the single post page. I would like the image to link to the Inventory page, just like the title “New Inventory’ does.

http://giddythrong.com/giddyup/

https://wordpress.org/plugins/posts-in-sidebar/