It's a little vague, but it seems to be saying this: - 가서 (내가) 만든 반찬 일주일분을 (그 집) 냉장고에 넣어두고 가고 싶어. (그 집 = their house) = I'd like to go to their house and leave the side dish I made in their refrigerator. It is saying that the speaker wants to put some food he or she made in the fridge of someone, but this is an odd thing to say, because you can't do such things without telling them. Normally what you would do is 만든 음식을 그 집에 갖다주고 싶어 (= bring the food to them).