Within the “Teams” section, you'll see three tabs: “My Team”, “Lives” and “Chat”
In the "My Team" tab, you'll be able to see the member ranking, from highest to lowest level.
In the "Lives" tab, you'll be able to send lives to team members in need and request lives yourself if you need them. As soon as you enter, you'll see a list of users requesting lives and you'll have to select "Help" to contribute.
If you need lives, you'll have to tap on "Request lives" in the lower right corner of the screen. A request to your team members will be issued and, if they help you, you'll receive a life for each contributing member. You'll be able to get up to 5 lives per request in total.