"It's" vs. "Its"

Newrosis is having some grammatical issues with the difference between the possessive "it's" and whatever the hell "its" is. This is especially troubling given that our current occupation is to teach English to small Korean children. We are reaching out to you, the community of Newrosis readers, to give us direction in this most troubling of grammatical SNAFUs.

Sincerely, the editorial department. Which is me. Just me.

I tried this page, but it is still not sinking in properly. Maybe its because I'm stupid. Or maybe it's because I'm stupid. I just don't know.