Ford f150 2007- making a whining noise, I have replaced power steering pump?

I was told by a shade tree mechanic that there was air in the lines, bc while it's running the fluid level in canister is moving around a good bit. What's the line i need to break to drain fluid out completely

The fluid level is always moving around because the pump is always running. Draining the fluid will only add more air. Turning the steering wheel lock to lock a few times will remove the air, unless of course you have a leak.