How do I set up the connection profile + AI response configuration?

I'm a complete beginner to silly tavern, I make my persona and basically copy and paste bots I like. Right now, I simply use AI horde, get a api key and try roleplaying. But I absolutely hate every response I get, the text cuts off before it ends completely, it speaks for my character or it simply doesn't make sense.

Title, how can I fix silly tavern to make it perfect for RP?