Monaca allows you to upload your app to iTunes Connect right from Monaca IDE. In order to do this, please do as follows:
When you successfully build a release version of your app, the
following screen will appear. Click on the
Upload icon as shown in
the screen below.
Then, the App Upload window will appear. Click Next.
Fill in a valid Apple account information. Click Next.
Make sure you’ve registered this app with iTunes Connect before uploading your app. Then, tick
We've registered the application with iTunes Connect.. Click Upload.
The uploading will start. Please wait.
If your upload is successful, the following screen will appear. It may take sometimes until the app shows up in the iTunes Connect.
Now that you successfully uploaded your app, you can start selecting it in iTunes Connect. Please refer to Selecting the Uploaded App.