I am installing a Chandelier in the dining room in a place I just bought! There was no chandelier in when I bought the house, but it had had one there. The wires from the box in the ceiling are white, black and a ground. I have a switch on each two entrances into the room. They are threeway toggle switches that turn the chandelier on. I just purchased a threeway threeway dimmer switch. The dimmer switch has two reds, a black and a green wire.
What advise do you have for running the wires to install the chandlier?

I will follow instructions in the switch boxes!

Red to red, black to black, green to ground... how do the white and black wires in the ceiling box come into play.

My main question is: can I use the dimmer switch with the existing toggle that is there?

Any help is appreciated!