I am attempting to add a second HITechnic Motor controller.
is there a place where I might find directions or a "schematic"

Thanks john

In ROBOTC, we have two default configuration for using the second motor controller. You can go to Motors and Sensor Setup when set to the "FTC" platform type. It's fairly self explanatory

As for wiring, it can either attached at the end of your current chain of HiTechnic devices (Sensor Port 1: Motor-Servo-Motor), or can be attach to Sensor Port 2 directly.