How to add search engine plugin?

[nipip2000]

Good afternoon, I am a QNAP NAS user.

I used QPKG version of qBittorrent more than half year. Recently, it was abnormal and I needed to reinstall it again.

After uninstallation and installation of new version of qBittorrent, I can not use search feature because I can't update / add the search engine.

I did try to install different versions of qBittorrent but I had no way to add any search engine. Is there anything wrong with my NAS?

Can someone teach me how to fix it?