1. Login to Apple Developer Member Center
  2. Click on People, then click on Invite peopleADP-invite people
  3. Fill in the invitation form and click Send invitation
    First Name: MobiPromo
    Last Name: Support
    Email Address:use the email address that we sent you (it is specific to your account, having the format support_XXX@publish.getmobipromo.com)
    Access and Roles: select Admin (we need the Admin role in order to be able to generate the certificate that will be used to sign your app)
    ios_invite_person_form

That’s all. Apple will send us an email to join your developer account and we will be able to generate the necessary certificates in order to sign your application for production publishing.