You can easily add sidebar features to Fintech manually. Just for reference this is what we mean by that on the main demo:
1. First add an image to the Media section of WordPress. The ones in the demo are 240 x 180px. Note the URL generated.
2. Next go to Appearance > Widgets and add a text widget to the Pages Sidebar Widget Area. This is what is used in the demo:
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3. Replace the # with a link to your own page and use the URL from your own uploaded image instead of the one in the demo content.