Tvheadend

Hi,

Can anyone explain to me (in easy to understand steps), how to add 'loose' M3u8 channels in TVH (without the use of a tuner)?
And also, how to add the correct EPG for them (mostly American sports channels).

Or if this has already been discussed, please point me in the right direction for a guide (using the current TVH version).

I am running a RPI2 with openelec as the backend and using an Nvidia Shield (with Kodi) as the frontend.

Thank you.