To use Lurker.tv as usual with your Twitch community you got three maybe four ways.
But first of all you need to create a Twitch account which is named like your community.
Now login with this new created account to Lurker.tv and do one of the following methods:
It is pretty easy if you got a official Twitch Team.
Just use the site like you use twitch.tv just replace twitch.tv with lurker.tv when you on your twitch team page.
a) you can use the /Follows/From/ function to Lurk all the people YOU (Your Community Account) are following on Twitch. Which kinds of allows you to be picky and have an exclusive community
b) Otherwise you could use the /Follows/To/ function to Lurk all streamer which are Following your Community account! Which is more likely as old communities worked as everyone could join a community.