Login to Apple Developer Site

Click the "Account" link in the top menu bar

Under the "App Store Connect" column, click the link labeled "Users and Access"

Click the blue "+" tab. This indicates to add an invite.

You will then see a pop up asking for the information for zingfit.

In the first name field, enter "zing"

For the last name field, enter "fit"

For the email address enter: mobileapp.ZingFitnessStudios@zingfit.com
​Note: Be sure that ‘studios’ is plural when entering the email address

Under "Roles", click "admin"

Under "Additional Resources", please check all boxes as shown in the pic.
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Then click, "Invite".