How to provide Admin Access on MailChimp?
Users who have a free MailChimp account there is no option to add a user/Admin. They needed to upgrade to the Basic plan which allows up to 3 additional users.
Log in to your Mailchimp account.
Click your profile icon and choose Account.
Click the Settings drop-down menu and choose Users.
Click Invite A User.
On the Invite A User page, input the email address (abc@growth99.com)
Choose Admin.
Click Send Invite.
If any trouble or query please feel free to write to support@growth99.com.