Use left and right arrow to change slide in that direction whenever canvas is selected.
Slide 1
Screenshot of H5P course presentation toolkit editor

Click the anchor icon to create a 'Go to Slide' radio button. Once inserted, bring this 'transparent' box to the front and place over the desired text/image. 

Proceed to the next slide to see an example.

 NEXT SLIDE

Which period of Japanese history would you like to learn more about?

Alley way of a food district in Japan

Kamakura Period (1192-1333)

Tokyo tower in the middle of winter

Postwar Period (since 1945)