Question need help connecting speakers to mixer to pc

May 3, 2020
A few days ago i bought new speakers for my room , they only got black and red wires input.
I want to connect them to an old mixer (Roland vm 3100) and then to the pc.
I managed to connect the pc to the mixer input but I dont know how to connect it to the speakers.
the mixer dont have wire input so I dont know how to connect it , maybe i need audio interface or some kind of adapter.
as you see all of this audio stuff is pretty new to me so any kind of help will be very appreciated.