Is it possible to create a slide that is only viewed if clicked on somewhere else? In other words, skipped by the "next" button but brought up when the user selects the "click here" option on a slide?

I've tried making it another frame but the Next button goes right to that second frame and skips the first one.

Any advice

Hi, Jade!

You were on the right way with another frame. The only thing that you should add:
right-click the first frame in Frames panel, select Advance dialog in context menu and set Advance parameter to "Wait for action" instead of "Immediately". In this case user will stay on first frame and second frame will be accessible only through GOTO action, attached to the button.