in Appearance > Widgets you can add an Image Widget to your sidebar.
Of if you want to add other content with the image then add a HTML Widget, and add this for your image ( taken from the content of your About page ):
<img title="Daniella the owner of Getmoresteps" src="https://getmoresteps.com/wp-content/uploads/2020/06/Daniella-Picture-150x150.jpg" alt="Daniella Owner of Getmoresteps" width="150" height="150">