How do I add a new Admin user?

You may have as many users (including Admins) as you need. To add a new user, simply go to Users > Add Users and fill out the form. If you want this user to be an Admin, you will check the top option in the User Roles menu. Admins have access to all functionality, all Departments, all Categories, and all Budgets

If you would like to create a new non Admin user with the same permissions as a current user, you can click the copy symbol on the right of the user you're copying from, then just change the personal details.