Go to Settings and Configurations at the top right of the page. This will take you here:
Within the horizontal navigation bar, select Stores. Then, select Package Type. This will take you here:
Click the yellow + Add button in the bottom right-hand corner. A blank box will appear below the established package types shown here:
In the blank box titled Name, type in the name of the new package type as well as select/deselect the checkmark to the right of the Name line.
When done, click the green Update button in the bottom right-hand corner to save changes.