I am not quite certain what you are asking?
If you are asking how to use the Attendance/Roll-Call feature, you can learn how in the Attendance Chapter of the Instructor Guide.
However, if you are asking how the Attendance feature can otherwise contribute to some sort of participation grade, I can only tell you what I do. I have created an Assignment Group that I have labeled "Participation", and within this group I have added all assignments I personally categorize as "participation" assignments (Discussions, typically). In this way, you will then have a sub-total column in your gradebook for all "participation" assignment.
If this is not what you are asking, please clarify and I will happily try again.