As this the most complicated thing besides the Player Blueprint and the UI I would recommend you learn how this all works when you looked into other blueprints first. But you can still easily use it.

I set up a example actor called "recorder" and everything will be changed inside here. So find it in the content browser its

1. Find the right component panel on the left
2. select audio in it
3. and there change the sound to the one you like

In the same panel you can change the models of the recorder just select the component you want to change for that.

PS: If you want to know how it all works and didnt understood it by the comments and simply sent me a message with itch.io or Twitter