My plug has been changed how do I get ep off of my unit

Which plug did you change? "EP" stands for Extended Play. A VHS recorder has three speeds. EP is the slowest. A standard 2-hour tape will record for 2 hours at the highest speed (SP), 4 hours at the middle speed (SP) and 6 hours in EP. There is a trade off. The faster the tape moves past the recording/playback heads, the higher the picture quality and visa versa. So EP gives you long recording time at a cost in quality.

I doubt that the unit being in EP mode has anything to do with the cable. You did not say what brand and model recorder you have, but in general, the speed is adjusted with a switch on the front panel (older models) or via your remote control.