Tvheadend

Hi,
I have one RPI2 with Openelec on it.
I've installed backend and frontend TVheadend on the RPI by the openelec plugins.
I can go on the configuration's website of tvheadend by localaddress:9981.
But I don't have a tv tuner.
But I can watch tv by IPTV with a .m3u file with simple iptv client.

I need tvheadend for can register program by IPTV.

Must I need a tv tuner for tvheadend work? Or with my configuration I don't really need a Tv tuner?

How can I do?

I've installed the Tvheadend backend on my Ubuntu server. But I don't know how configure it without tvtuner but for have IPTV channel with .m3u and for recording.

Thanks you for your help.