To install the plugin to the following steps
- Install and activiate the plugin via the admin plugin page.
- Install the plugin Link Manager to bring back the pre-WP 3.5 Link System
- Go to the widget page and add it to your sidebar.
- You can choose as source "Links" or "Posts" and choose a certain category
- If Source is "Posts" you need to setup custom fields in the post page and insert respective names holding image url target page url (see Screenshots)