No. You cannot edit the Apple ID you use to sign in to iTunes Connect. You can only edit your first name, last name, and your email address as part of your personal details for your user profile in Users and Roles.
You can do so by using Users and Roles section on iTunes Connect. If you are an Admin iTunes Connect user, you can create, edit and remove users of your provider’s iTunes Connect account. You can also manage the roles, territory access, change username or email information and assign email notifications to your current users.
You can create a new iTunes Connect user by clicking on the + button within the Users and Roles section. You can edit an existing user by clicking on the Edit button at the top-right of the page. You cannot edit your own user role or territory access but must have another Admin user for your content provider do this for you.
Enter the corresponding information for the user your wish to create or edit. The username you create is case sensitive and we recommend you use the user’s email address as the username. If the username that you choose already exists on another content provider account, you will not be able to use it again. If the username is already in use for another Apple account, an iTunes account, for example, you will be warned but will still be able to use this information; you would just need to sign in to iTunes Connect with your current username and password for that account. Your new username is called your Apple ID.
You will also be in charge of assigning roles, access and notification types to the new user.:
Encoder: Access to the advanced specifications and Transporter*. This role should be assigned to encoding house contacts authorized to deliver content on behalf of your organization. It is designed for users to be able to obtain updated versions of iTunes delivery software, as well as the corresponding specs.
Note: the sections available to your organization may be a subset of those listed in each role description above.
When creating a new user, be sure to provide a valid email address, as this will be the email address we send your notifications to.
Users and Roles allows you to control who in your organization has access to the various iTunes Connect sections. From this page, you can view users, create new users, and delete or modify existing user roles and notifications.