In Eagle, you can create users and update user permissions in the user management area.
Note: Only the account owner can add new users. Users who have been granted 'user permissions' can edit users but not create new users.
Adding a user
Go to 'Settings' (top right corner)
In the left menu, click 'Users' (if you can't see this page it means you don't have permission to manage users, contact your account owner to update your permissions)
If you have reached your user limit, click 'Increase user limit' to increase your plan limit
Click 'Add New'
Enter the users name, email and password
Select the permissions you would like the user to have
Click the submit button
Editing a user
Go to Settings > Users and you will see a list of users in your account
Click "Edit" on the user you wish to update
Make any changes you like and then click submit