The key to practicing good bankroll management is patience, patience, patience! You have to set a limit as to the % of your bankroll you are going to play, and stick with it
. Something that, depending on the size of your bankroll, will be able to help you withstand the inevitable variance that comes along with playing poker. Play above your limits, and it's a recipe for going busto.
Know when to stop. If you feel yourself tilting to the point of having to win back your losses, STOP PLAYING. Take a break. Go for a walk, whatever it takes, until you can come back to the tables refreshed and ready to go. I find sometimes a few days break or more helps me when I'm running bad.
Here are a couple useful articles you may want to read as well:
How to Build Your Online Poker Bankroll: Where you Should Start
Online Poker Guide (http://www.cardschat.com/poker/guide/)