Here is the tumblr version of the tutorial which is much better than this cobbled together thing!!
This is a pretty simple tutorial, I wasn't gonna cover everything. NyanChat is kind of a mix of openCanvas 1.1 and Paint Tool SAI with networking capabilities, so if you can use those, you can probably use this program with a bit of practice.
For a very basic tutorial please refer back to Nitro's Original Journal
For those that wanna get started right away and don't wanna mess too much with brushes, I suggest just installing my Custom Brushes until you can sit down and mess with the brush settings. My brushes aren't fantastic or anything but they're okay enough for doodling!
Thanks to Nitro for unearthing this thing and thanks to the people who've joined my sessions to allow me to play around with the program a bit.
Downloads:NyanChatFiz's Custom Brushes
Links:NyanChat Site (JP)NyanChat Changelog (JP)