You should be able to record a video input via Scart, for example. If you have a STB you could get an output from there. This should enable recordings to be scheduled by programming the STB and DVD recorder. If you have Freeview built into your TV there might be a Scart on the TV which will output video of the programme being viewed, which will enable that to be recorded.
As everyone says you need a Freeview STB which can cost under £20 at ASDA etc. Connect it to your recorder with a SCART lead and feed the incoming aerial lead to the Freeview box first. Then chose the correct input for the DVD recorder (possibly AV1 or AV2). You could use an antenna splitter feed the TV and Freeview box or maybe you can loop the coax through the Freeview box then onto the TV.
I'm afraid the recorder you bought was essentially obsolete when you purchased it, a lot of old stock of analogue only recorders are still in lesser known outlets.
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