Answer: She is telling Macbeth to picture himself as Thane of Cawdor (king), but still reminding him that even though they are murderers, they will not act as such. Lady Macbeth is invested in the idea that she will come into power through her husband, seeing as 1 she is not a man 2 they cannot have children. So her husband will have to put on a show and she already is in a way, playing the innocent housewife.
Explanation: That's the explanation for scene 5 I dont know if that's the scene but I did lines 60-68 on scene 5 of act 1