Will not start, there is no sound at all?

The battery is charged. I don’t know how to check if it's connected besides on the battery post. But Nothing, no clips, no sound of a want to, nothing. I really don’t understand. The only thing that was switched out was the radio. It’s 6 C-section radio went out. I replaced it with updated Bluetooth with rear view. I need a wiring diagram for that to double them. And I need to know where the battery is connected to the starter and what (if any) of the fuses I would need to replace. Please help ASAP.