The cables will only go on one way, and it doesn't really matter which one you plug into what drive. The floppy drive will have it's own specialized ribbon cable and power cable, the ones for the burner will be the same as the hard drive.
Just remember not to apply too much pressure. The cables should go on fairly easily, so if you have to really push on it, you've got something the wrong way. You don't want to bend or snap off any of the pins on the burner, or it may be rendered useless.
The other thing to remember, is to keep yourself grounded to avoid introducing a static charge into the system. All this means is to just keep yourself in contact with something metal, like the case of the computer. Better to suffer a painful shock than knock out a bunch of the equipment in the computer.
I have a computer a friend disconnected cables and put a cd burner into
the computer but did not connect the cables can anyone send me a link
that would show how to reconnect the cables to the floppy drive hard drive
and cd rom and the cd burner none of the cables are connected i checked
with a store and they want to charge me $50 dollars to do it for me any
help would be appreciated