First of all you need to know that Six Sigma professionals do not always agree as to exactly which tools constitute the set. I would recommend that you first try to know in which Six Sigma phase this toll can be used. Then, many website ( such as: http://asq.org ) could provide you with the main usage of the tool and how to use it. At last you try applying this tool on simulated data may be in Minitab or using Excel template.