If you’ve already uploaded a release to eMastered, you can still add optional features like the Global Credit and Recognition, Social Media Monetization or Maximum Reach Distribution afterward.
Just go to the Catalog page in your distribution dashboard and scroll down to and click the release you want to add extras to:

Once selected, scroll down on that release page until you see the “Extras” section:

From there, choose the features you want and click “Add Selected Extras” to apply them.