Easiest: press Step by step at the top of any page. It goes one short page at a time: your group's name and town, your people, where you meet, and your first date. Later, the same button asks what you want to do: add people, take someone off, change roles, or change the group's details.
Or do it yourself:
Under the header there is a bar that starts with Next:. It always points at the next thing that needs you, such as Next: add your players or Next: choose who gets an offer. Tap it and it takes you there.
Nothing is emailed until you press a button that says so, and GLAR always shows you the email first.