Sorry, but that is actually covered in the above cited page, for example:
Note: At the time of writing it is not possible to delete or rename packages from your project, and you must ask an administrator to do that for you. You should therefore be cautious when entering your package name to avoid needless interventions.
The same thing also goes for tags (the above is implemented as tags in the new scheme):
Note : At the time of writing it is not possible to add tags or other meta-information to the game header.
Please be sure to read the How to upload modules to the Game Library fully (well, perhaps skipping the collapsible parts - unless you want the full picture).
When features gets added to the Game Library, the page will be updated with the relevant information (note, the page is marked as a Wiki, and anyone can edit it).
Yours,
Christian