Generally you don’t. Your overflow is a herbie drain. It’s one full siphon pipe and one emergency drain pipe (drain pipe is in red).
Your full siphon pipe will go to the drain location near your filter sock.
Your emergency drain will need to be routed to a different section of your sump (center compartment) and the end of the pipe needs to be a few inches above the waterline in the sump. This way, if water is coming through your emergency drain pipe (which it shouldn’t, unless your primary is clogged) you’ll hear the water splashing and know something is wrong.