Ok, so you have power beyond on the loader valve already hooked up.
You need to get the valve you want plus the Power Beyond plug/sleeve for the valve you're buying. You'll need a couple hoses and fittings.
Then you take the Power Beyond line from the loader valve to the IN port on the new valve. You might need to take the cover of the loader valve to confirm what line corresponds to what. It should have a marking like PB or C.
The Power Beyond port of the new valve with the PB sleeve, will then feed the rest of the tractor hydraulics (3 pt and remotes).
The Tank lines will be Tee'd together.