The cables came loose from the pulley while attempting a repair. How can I get the proper cable back on the pulley? 

Also, my foot control is stuck and won't steer my motor. I tried loosening the front screw under the pedal but that didn't work. Help me get this baby working again, I'm going insane. It is a Minn Kota Edge 55.

I got the cables on the pulley, but now I have the opposite problem. They are too loose, and the pedal moves without steering the motor. The screw at the bottom of the foot pedal is tightened all the way.

I took the cover off the powerhead. Where do the right and left cables go, both are loose?

Wish I could help you! Last time I took apart a TM head I broke it. I always hire electrical work done 

It sounds like the cables aren't routed correctly.  I successfully replaced broken cables on my old Minn Kota Maxxum last Autumn.  Before doing so, I watched a YouTube video to make sure I was properly routing them.   I suggest finding a video for the Edge.  They may route the same as the Maxxum but you should confirm this.