Should be something like this: The aerial coax goes into the digibox, then into the DVDR then into the telly. A scart cable goes from AV1 on the digibox to AV1 on the telly. Another scart goes from AV2 on the digibox to AV1 (or AV In) on the DVDR. Final scart goes from AV2 (or AV Out) on the DVR to AV2 on the telly.
If you want to record from the digibox to the DVDR, then there should be an input select button on the remote so you can select the AV In, otherwise, have it record on the actual channel number but then it won't be in digital. If you want to record on the inbuilt video, just have it record from AV1.
If you're trying to put DVD's onto video, there might be some copy protection going on.