The person who downloads the app and registers is by default the super admin. He can manage and make any other person super admin too.
Step 1: Download the app from the play store or app store.
Step 2: Register or sign up on the app.
Step 3: Add your company details and proceed to invite people.
Step 4: Select the contacts you want to invite.
Step 5: Select the group in which you want to invite and click the check mark.