The volunteering section of the DofE is all about making a positive contribution to your community. You can choose to volunteer as a team or an individual and in all kinds of ways.
Your volunteering should ideally be on a weekly basis over the period of months required, this can be 3, 6, 12 or 18 months, dependent on what you have done before and how long you choose to do the other sections for. Weekly involvement should average one hour per week and you should not spend more than a quarter of your time training for your activities.