There are a couple easy ways you can sign up for activities.
First of all, check your home page and review the section titled "The Week Ahead" as this will show you any upcoming opportunities and allow you to easily sign up.
Additionally, you can go to the Activities page and click on Show More on the right side of any event, item, or volunteer request. If there are available signups, you can assign yourself by clicking on the + inside the circle.
You can also change your signup at any time by clicking on the circle with your picture or initials and selecting 'Remove'.