U-Mix 44 and speakers

Hello.
I have the DVS Ultimate system and i use it with a Numark tt200 turntable and Numark m101 mixer.
But i have a problem,in the manual say's to plug the speakers on the U-Mix44 soundcard.
But my speakers are 2.1 ''pc-speakers'' and they had only one 3.5 mm jack.
Where i connect it?Thanks a lot.
Your advice will be very useful.
I have the DVS Ultimate system and i use it with a Numark tt200 turntable and Numark m101 mixer.
But i have a problem,in the manual say's to plug the speakers on the U-Mix44 soundcard.
But my speakers are 2.1 ''pc-speakers'' and they had only one 3.5 mm jack.
Where i connect it?Thanks a lot.
Your advice will be very useful.