In order to start the process of publishing your iOS app to the App Store, you will need to have access to Apple's iTunes Connect. But first, someone within your organization must enroll in Apple's Developer Program. Once your organization enrolls in the Developer Program, you will then have a Developer Account.
To enroll in Apple's Developer Program, follow the steps at:
Once you have a Developer Account, the person who enrolled will be considered the team agent. The team agent can then use their Apple ID to sign in to iTunes Connect. This person also has the capability to grant users access and delegate responsibilities.
For more information on iTunes Connect please refer to Apple's guide here: