You can easily add team members to your team under Organisation in the dropdown when you click on your name in the top right of the navigation.
To add a team member all you need to do is to enter their email address and hit send the new member will be sent an email invite with a link to set up their new account.
You can select team members and adjust the permission levels each member has. The permissions range from and admin that can edit everything to a viewer who can only view content and not able to edit anything.
If you need to give your admin privileges to another team member you are able to do that via this form as well.