How do you reply to a comment?

I just wanted to throw in my 2 cents that although it did take me a bit to find it, within a day and a half, I'm already accustomed to the slide to reply feature. For those who might not have found it yet, you can also slide to reply to a post from the home screen.

P.S. I'm really enjoying the webapp. Thanks for all the hard work, dev(s)!