Class Dojo is extremely easy to use. It is free and a great tool for the classroom. There are a lot of way to implement this program into the classroom. Try it out and see what works best for you and your students. I personally like to group the students and share the screen that way. Many teachers have great success with individual as well.
Class Dojo has a great support page titled "teacher help desk" where you can view the frequently asked questions, and helpful videos to get you started. I recommend looking through the help desk before getting started.
The team at Class Dojo has done an excellent job up building this program and adding features each year. If there is a feature that you need that is missing, use the "submit a request" feature to ask for features that you need. This is a great way to be a part of the process and build the program to your specific needs. Review collected by and hosted on G2.com.