Long story short, my 1st 3d printer that i ordered came in the mail, and i'm stuck on one part while setting it up.this is what the directions say:^the problem is i don't know how to do that. I know i'm supposed to add it to the top part of the printer, but where and how? the directions aren't clear on that at allthis object is what i'm stumped on, the extruder:this is how far i'm on it right now:and this is the printer that i'm trying to set up:can someone please help me with this and tell me what to do next? how and were am i supposed to put the extruder?