You have 3 connections on the back of your Humax box.
1 RF in - connect your TV aerial to this socket to enavle your Humax to "see" the incoming TVprogramme signals and record them.
2 RF out - connect a lead from this to your TV - this will enable your TV to "see" incoming programme signals and let you watch them, regardless of whether you Humax is on or off.
3 HDMI - connect a lead between this and an HDMI socket on your TV - when you select "HDMI" input on your TV it will let you watch programmes recorded on your Humax box.