Use the RCA phono jacks from the mixer to the tape deck. Some people also use these same outputs to hook up into a amplifier and use the "Tape Rec" phono jacks of the amplifier to record direct into the tape.
A word of advice: Never, ever buy any equipment from Radio Wack, er.. i mean Shack!
They sell low end crap that usually breaks down after 3-4 months and the performance of the equipment is very poor!!!! Peace 2-fingers!