Here's where you'll see all the available opportunities. At the top is all your Serving Teams again in case you want to look at other serving opportunities. Skip straight to "Step 2".
In the Calendar view you can see the selectable roles, on the left, and several of the next serving times along the top. Available slots are shown as "people needed", with the amount of people needed for that time and role. Note that you can also see other volunteers signed up at that same time, in case you see a friend you want to serve with!
In the example to the right, we're going to click on the "2 people needed" for 18 Mo. & 2 Year Olds for the 9:15 service on Feb 5 in order to sign-up our Grace Volunteer.