The Widget comes with 3 skins:

1. Gallery
2. Slider
3. Single image

Gallery Skin

The gallery skin allows to choose an existing album from a drop down list populated by the API and also the ability to turn captions On and Off

Slider Skin 

The Slider Skin allows you to turn Captions On and Off

Turn auto start slider On and Off

Turn Slider height On and Off

 Single Image Skin

The single image skin allows you to choose images from separate dropdown menus with the list of all images 

1. Purchase the plugin
2. Activate it as any other plugin 
3. Get the API as indicated below

With your SmugMug account apply for an API here https://api.smugmug.com/api/developer/apply

Once the API is obtained you will enter the API Key you have to fill out the username and API key 

1. Go to the Widget menu
2. click on Other
3. Drag and Drop
4. The default skin is the Gallery so you can click on the skin selector settings to witch it to Slider or single image 
5. Tweak the skin settings on the popup widget settings according to your needs an enjoy.