How do you reach Adam, Austin, and Kara? 

Anyone?
Are there any “mods”?
Who runs this site? 

Go up above and click on the "Help" link, then on the page it opens, click on "adam" in the "Welcome to the HELP Underground." description. 

I have and no replies 

You could try snail mail...
This addy is from the Kingwood Bookoo page...
248 Foster Dr
Oswego, IL 60543

or email... info@kingwoodyardsales.com 

Draw a dollar sign on the floor with animal blood. Then repeat this chant 3 times, and they will appear: "Kingwood Underground sucks".