Currently, the distributed category offers two tiers of classification. This is the genre and subgenre. There can only be one selection for each, with the subgenre corresponding to the appropriate genre.
You can edit/update your genre metadata by following these steps:
1. Log into your account
2. Select "Manage/Reorder My Books"
3. Select "View/Update Metadata"
4. Select "Edit" for the section that you would like to update
5. Proceed through the prompts