After you have an apple developer account (please make sure your developer account is approved by apple) all you need to do is to enter your app dashboard in our system and ask us to upload the app to your developer account.
When you enter the submit form you will have all instructions. Please follow the instructions (if you all ready share firebase with us there is no need to share again)
please make sure you all ready contact the premium support via WhatsApp, If not please contact them.
Its very important that they will be able to reach you if there is any problem and the submit team will need the 2 auth codes to connect Xcode and upload your apps.
After the app will be uploaded to your developer account you will get an email and WhatsApp message