All admin level users with access to your Logic CMX account are able to add, edit, and delete other user accounts by logging in at yourdomainname.com/admin and then navigating to the Account tab (cog wheel) located at the bottom of the left rail and selecting User Accounts.
You will then see a list of current user accounts. Select the Add Admin User purple button at the top right of the user table to add a new user. A first name, last name, email address, and password are required to add a user. All other fields are optional.