When you set up your space, you are automatically registered as the administrator. If you add more administrators, they will be able to access the same features you can.
In order to add someone else as an administrator, go to the tab Setup, and opt for Administrators in the left-hand sidebar. Then enter the name and email address of the person you wish to designate on the screen. As soon as you press Add Administrator, the person in question will receive an invitation by email.
One administrator will be marked as the 'owner' of the space. He or she can transfer this ownership status by clicking the button Make Owner next to another administrator. Similarly, administrators can be removed by clicking the Remove button next to their name.