When you create a new account with Airim, you are already added as an Admin. You can add multiple members from your team using the 'Manage Team' option in the 'Settings' tab.
Click on the icon marked with a red circle below to add more team members from your organisation.
Once you click the icon, you'll get a screen to enter details such as Name, email ID, Password and Access Level of the new member you wish to add.
Once you save the information, you'll see that a new member is added to your Airim account.
Please note that there are two access levels for your Airim account, Admin and Agent. You can choose the access level of a member while adding her account to Airim.
While a person with Admin access can add or remove team members, Agent access does not have that priviledge. There is no other difference between these 2 access levels as of now.