Details of the service and sign up links will be there.
Seniors: You need 30 hours of service this school year (and can use hours from the summer prior). At least 10 of those hours must be from opportunities posted in Classroom. The remaining 20 can be ones that you find independently, or they can also be from those posted in Classroom. 10 or more hours should be be turned in before Winter Break with the remaining amount due on or before Seniors' last day of school.
Juniors: you need 20 hours of service accumulated this school year beginning from the date of your application until the end of the school year. There is no restriction on where you earn your service hours. You can use the opportunities posted in Classroom, or you may find them independently.