Hi i have a sega megadrive 2 and have only just got it out, but now have a Bush digital TV and the Sega is on (power) but I can't either locate the channel or am confused on how it connects up to the Tv to show on screen.

I think those have the old style RF connectors.A coaxial cable with a grey or black box in the connection cable.Plug the coaxial cable from outside into the RF cable.Plug the RF cable into the TV coaxial input(regular cable input).On the back of the Sega,there should be a switch for CH3 or CH 4.Put the TV on the appropriate channel.If the signal looks bad,switch the selector on the Sega and change the TV channel.If you do not have the RF cable there is a place that still sells Sega accessories,but not Sega.They must have contracted with Sega.If you need the site let me know.
Good luck!