“I just moved in.”
Move in means to begin living in a place; the opposite is move out. Adding just indicates that the move happened very recently.
A2-23 / CEFR A2 / EPISODE 23
Asking a neighbor about building rules
SceneIn the corridor of a building Frank has just moved into.

WORDS & CONTEXT
Move in means to begin living in a place; the opposite is move out. Adding just indicates that the move happened very recently.
Here bang is a verb meaning to make loud banging or knocking noises. The heater makes noise all night. This is a different use from bangs (the hair over the forehead) in A2-10.
Literally "Does that make sense?", this is a standard way to check, right after an explanation, whether the other person followed it. Here Frank checks whether his method came across: find the picture in the handbook that matches your heater, then read the instructions below it. Answers include Yes, that makes sense. and Not really.
Come over means to visit the other person's location, especially their home. Unable to follow the explanation, Tina asks for someone to come and look in person.
Start from ... means to begin at a certain point. The neighbor just wants Frank to look at her heater, but having heard she has never opened the handbook, Frank plans to explain it from page one, not from the heater page, page nine. The punchline is that he is so eager to help that he wants to start the explanation from the very beginning.