Hello All, I just got a MacBook Pro and I have NO idea how to secure it. I got it as an open box from Best Buy and EVERY TIME my Mac asks for the username and password, bestbuy is ALWAYS in the username (I have to change it every-time). Also, when I go to "trash" there's a shared computer that says your-0o exc. I have A LOT of important documents and I want to keep them secure (I keep thinking that Best Buy has access to my Mac) So I tried to use FileVault<-but I have NO idea what or how that will work. Please help me.