Hi,
setting up a STB, Video & DVD is actually quite easy, but being at the back of the telly is not fun.
anyway, has your TV got scart sockets, it should look like:
You may have more than one, if it is a newish TV, hopefully 3.
the scart leads look like:
Just plug one end of the scrat into your DVD, and the other into your TV, if you have a free scart socket.
You should not need to tune this in, but you should not find it in any numbered channel, but like an AV channel, it may be called E1, E2, E3 (depending on your TV make), refer to your TV manual on which button to press to get to these channels.
good luck
ik