I’m not often online recently, because of our national festival, so I hope you can just create a test admin account for me, and tell me your link with private reply, when I online, I will check the issue 4 and fix it, OK?
Could you tell me your link with private reply? I need to check the 1,3 and 4 question in wp dashboard.
For the issue 2, you can go to settings > readings, set the number of product there.