i was going to change my speakers today when i noticed there was like a box thingy were the speaker cables go not to mention i cant tell wich is positive or negative? please help ..also do i have to use terminals?

01 lincoln ls v6

Do some research, there is a ton of info out there. The key to success in any install, both simple or complex is to learn about the application. Get to know the job instead of walking to your car with a screwdriver and scratching your head. Wiring diagrams are easily found, and so is the information you need to decide your best path.