Help! I am unable to update my Product Listing

Hello,

I am a new seller. I am a publisher selling a book. I have been trying to find a way to update my product listing details for the last 10 days but nothing I do seems to work. I have raised 8 cases with Amazon support, but every time they respond with scripted responses that make so sense and close the case as “answered” before checking my issue is resolved. I am so frustrated.

So, the last advice I got from “support” was …
"Your listing is not currently assigned to a product category. Therefore, it is not searchable on Amazon. To update your category, complete these steps.
Use the following link to open up your Manage Inventory page:

1. On the Manage Inventory page, click on Edit next to the product you want to fix.
2. Select “Vital Info” and fill in the required information in “Recommended Browse Nodes/Item Type Keyword”
   If not found:

• Toggle the “Advanced View” to on
• Fill in the needed information in “Recommended Browse Nodes/Item Type Keyword”"

However, when I go to the Manage Inventory page and click edit, there is no attribute for “Recommended Browse Nodes/Item Type Keyword” and I can’t see anywhere to toggle to an Advanced View. Also I can’t even find a list of Recommended Browse Nodes/Item Type Keyword values, so I can’t tell “Support” what they need to update. They won’t tell me where to find these things, so I’m hoping someone here knows.

Please help. I’m losing my mind.
Thanks,
Jonathan