For VHS to DVD, put the tape to dub in the VHS slot and a blank DVD in the DVD tray. Make sure the DVD is compatible with the DVD recorder (see the recommended disc list) and is unfinalized if you are using a R/W disc. Close the tray. Set the unit to VCR mode with the DVD/VCR button. Advance the tape to the place that you want the recording to start. Then press the Dubbing button (either on the remote or the unit itself). Select the recording mode (SP, LP etc), highlight Dubbing then press Enter or Dubbing. Press Stop to interrupt the recording.
For DVD to VHS, put a blank tape in the VCR (make sure the protection tab has not been broken off) and the DVD to duplicate in the DVD tray and close the tray. Put the unit in DVD mode by pressing the DVD/VCR button. Find the point at which you want to start recording the DVD. Again press Dubbing and set up the recording mode and highlight Dubbing and press Enter or Dubbing.
Note that copyprotected content can not be recorded.
The manual for this recorder is on the right side of the page here: http://www.lg.com/us/tv-audio-video/video/LG-dvd-recorder-RC897T.jsp
. See page 48 for the screen captures of setting the recording mode part of the dubbing procedure.
I hope this helps.