Tvheadend

Hello everyone,
I am need of assistance in configuring TvHeadend on my RaspberryPi.
I have enabled TvHeadend and I am able to access it via a webbroswer on port 9981.
Under the DVDB imputs section i have the option for IPTV where i can enter channel information
now it ask me for the the following: Enabled, Channel Name,Interface, Group, UDP Port
So I enter Yes, My Test Channel,wlan0,239.1.3.212,1234
I notice in the Group option that is has 2 :: before i enter anything, am i meant to remove these, place something else there
There is nowhere to enter the ip address of the server it is meant to connect to.

Forgot to mention that is is version 3.4.27

any help would be great
Jay