phpbb recent topics

If there’s an RSS feed of phpbb themes, you could use one of the many RSS widgets to put that in your sidebar.

I do not know how it works ??

>> want a list of the latest phpbb theme <<

Where does one find them?

the same as
this

That plugin (now defunct) is for integrating WP and PHPBB with list of recent topics. That’s not what you’re asking, if I understand. You want a list of themse for PHPBB. I asked you “Where does one find those?”

I’ll leave you with this: other plugins that talk to phpbb. https://www.ads-software.com/plugins/search/phpbb/