如何保存到当前用户\桌面位置

So I am trying to save an excel worksheet as a .PRN file to the current users desktop. I thought maybe there was a standard "wildcard" operator that I could use, but I don't see that anywhere. I have looked through stack overflow and I found information that is probably what I am looking for, but due to me not being a programmer and not very good with excel, I don't know if it is what I want and if it is, where to put it in my code. So I am trying to save an excel worksheet as a