On the Settings page, you can control whether the student dashboard and the homepage display class attendance percentages, daily attendance percentages, both, or neither. Look for the "Attendance Model to Display" setting. 

Use this setting to control which type of attendance is displayed in the student dashboard and on the homepage.

To learn more about attendance in Schoolrunner, this article gives a wide overview. If you're interested specifically in viewing class attendance, read this article. If you're interested in daily attendance, read this article. Or if you're interested in how the two attendance types interact, read this article.