Kubota M59 rear hydraulics

I bought an M59 w/o the backhoe. I want to run hydraulics to the rear. It has auxiliary hydraulics to the front. There are 3 lines at the rear with plugs. There is no lever to push/pull to apply hydraulics to the backhoe (ie hydraulic fluid) as I had on previous tractors-L48 and L35. I have a feeling it was never installed. I have a blade with an angle cylinder that I used on the L48. It has a control valve mounted on the blade. I simply attached the quick attach connectors and moved the lever to angle the blade. I am getting conflicting advice. Some people say I need an additional valve or something in the back. As I see it I should be able to mount quick attach connectors to two of the rear pipes, the fluid would circulate through the valve on the blade and back to the tractor. When the lever is moved then it would activate the cylinder. Any comments from someone who knows more about hydraulics than me? Thanks!