Heya!
So the steps for this one are pretty direct;
1. Interact with the microwave by walking up and pressing spacebar until it talks about needing to unthaw the meat.
2. Turn on the power outside by interacting with the power box (this is located right next to the front door of the cabin).
3. Go back inside and walk up to the microwave again and press spacebar or click where Theo is standing, not on the microwave to turn it on.
Let me know if you need any more guidance!