I installed Oxwall version 1.5.3 and the slideshow did not appear on dashboard like above. Any clue? Arm, you won't find settings for this plugin in admin panel.
Once the plugin is activated just go to, for example, your main page>>click "Customize this page" button>> "Slideshow" widget will be among inactive ones.
You can place "Slideshow" widget anywhere on the opened page using drag&drop tool.
Use "Setting" button next to the cross to add images to your slideshow.