How to Use the Jetpack Sidebar Image Widget
Before beginning this tutorial you will need to install and activate the free Jetpack plugin. Read this post for instructions on how to install Jetpack.
Jetpack includes a handy widget that lets you easily add images to any widget area available in your current theme. You can enable more widgets and features from the Jetpack settings page, accessible in the sidebar of your admin dashboard. This section will guide you through activating the image widget and placing an image in the sidebar of your WordPress site.