What do I put for the target pin on the interface functions?

Take a look at this section: Frequent Question: How to get a reference for the target pin?

I get a lot of errors when I add the asset to my project

Try this: Step 1: Enabling the required plugin (Important!!)

How do I change the look of the slideshow window?

Have a look here: This is the widget that will show the user the slideshow, here you can alter the appearance of the widget and how the slideshow UI looks.

Where are the screenshots stored?

Check this out: If you are wondering where the screenshots are stored, there are two different path depending on how the game is launched: