Rear remotes or loader 3 functions come in pairs (big tractors can have some other options, but let’s keep it simple here.
These are typically controlled by a valve. Valves come in open center and closed center. Most common for smaller tractors is open center. This means that if not redirected by the operation of the valve, fluid continues to flow through the valve if not being used.
Specific to your tractor will be how you get fluid to the valve (supply) and the path from the valve to the reservoir (return to tank)
Again this KISS explanation.
So you need fittings from your supply source for your tractor, to a hose to your control valve, then a hose from the valve to fittings for return to tank.
Additional you need 2 hoses from your valve to the location you want these remotes located, typically these connect at a mount location with quick connects.
The valve allows either side of the remotes to act as the pressure/return hose from the implement.
Use a color coding system so you can consistently connect the implement to the same remote sides. Color zip ties are simple. Different cap colors are also common.