Can you please tell me how to bleed the rack an so that I can refresh the system

There is a machine that can be used for that, I have one, but the easiest way without it is to suck the fluid out of the sump, turn the wheels to the right and leave them there. Start and run the car for a moment, stop the engine, and repeat the process several times until the fluid is clean, don't forget your conditioner.

HYDRAULIC SYSTEM BLEEDING 1. Raise and support vehicle. Manually turn power steering pump pulley a few times. Turn steering wheel lock-to-lock 5-6 times. Disconnect and ground ignition high tension cable. While operating starter motor intermittently, turn steering wheel lock-to-lock 5-6 times for 15-20 seconds. 2. Ensure fluid level does not fall below reservoir filter level by checking fluid often during bleeding. Reconnect ignition cable, start engine and allow to idle. Turn steering wheel quickly lock-to-lock until fluid level no longer decreases and no bubbles appear.