You are the owner of any applications you created with your Developer Portal account. Owning an application means you can view and edit it and manage other owners. Applications can have multiple owners. Owners besides the application creator must be invited to the application in order to manage it.
To invite other owners to the application, from the Applications screen, click the Actions icon and select Invite Owners. A modal appears asking for the name and the email address of the owners to invite. You may also write a note to send with the invitation.
A limit of five owners can be invited at a time. If more owners are needed, simply repeat this process with the additional owners.