Woops, that might’ve been a good thing to stick in the ReadMe, I suppose… Just unzip to your project directory, in the “Content” folder (where your maps and other assets are, there is probably already a Blueprints folder there). Load the editor and they should all magically appear 
Any kind of mention is fine in your game credits - “thanks to Cory Spooner for Morepork Functions”, or just a name under a general thank you’s.