How do I edit the contents of the support tab on the item detail screen?

Hello. I have a question about uploading items.

How do I edit the contents of the support tab on the item detail screen?
I’ve registered one item before.
Failed to find a way to enter text in support tab next to detail tab.
I would appreciate it if you could leave a url or tell me how to get help.

go to your item Support Page/tab there you will see:
Popular questions for this item Add new FAQ

Just click ‘Add new FAQ’ and set your content there and Add FAQ.

Thank you for your accurate and quick response. Thanks to you, I solved my problem!