How to replace broken chainring that is missing a tooth I was going to ask if I need to replace it but I'm certain the responsible answer is yes (comments welcome). How do I find and replace the outer chainring?

Specifically find the right model or compatible part and the dummys checklist for doing the task at home, perhaps some good links. According to the Kona Cindercone 2011 specs the chainring is the 44 tooth "42/34/24" (incorrect spec) on a Shimano FC-M521 crank arm.



Notice how I haven't even worn off the stickers... yes I am a newbie who either broke the tooth tumbling off an intermediate trail, or worse still hopping a curb.
Just buy a 104 BCD (Bolt Circle Diameter) chainring with the same number of teeth (probably a 42 tooth on this model).  Try searching for '104bcd 42t' on google.  

Unbolt the chainring bolts (you may need a chainring nut wrench to hold the bolts while loosening or tightening them like the Park CNW-2C) and then put the new ring on and bolt it back up.  You may need to remove the crank to get this on, but usually you don't have to worry about that for larger outer chainrings, so I think you'll be able to skip that step.