When you are away from home you should look after you.将最后一个 you 改为 yourself

问题补充：

When you are away from home, you should look after you.将最后一个 you 改为 yourself，

答案：

(答案→)将最后一个 you 改为 yourself，

解析：look after oneself 意为“自己照顾自己”。