What is your source? Since the DVDR3305 has an analog PAL tuner and most TV stations are broadcasting in digital, you probably have some sort of set top box connected to the recorder. If you change the channel on the set top box, you will record the program on the new channel. If you are recording PAL and your TV has a PAL tuner, you should be able to just record one show while watching another with the DVDR3305 daisy-chained to the TV. Just make sure to change the TV channel not the channel on the DVDR3305.
If your TV has a digital tuner, you can split the signal before the set-top box to record one channel and watch another. (Note: basic splitters will cause some extra loss of signal and may reduce a digital signal below the threshold needed to tune in the signal. An amplified splitter can avoid this - when the amplifier is working properly.) Otherwise, you need a second set-top box (or a dual tuner set-top box).
On my set-up with an aerial antenna, I would put the splitter between the wall jack and the electronics. The incoming cable goes to the splitter, then cable 1 goes to the TV. Cable 2 goes to the set-top box. Tune the set-top box to the channel to record and check the settings with the TV set to the DVD source. (DVD set to record on Tuner (and the specific channel of the set-top box output) or front s-video or EXT1 or EXT2.) Then change the TV back to the TV source and change to the channel for the second program.
The manual for the DVDR3305 is available from Philips. The link to the manual is http://download.p4c.philips.com/files/d/dvdr3305_05/dvdr3305_05_dfu_eng.pdf
I hope this helps.
(I actually use an A/B switch and do not try to watch a second program on the TV connected to the DVD recorder. However, most of my recordings are for time-shifting of programs that air when I can't watch any TV program.)