I just registered with this forum and wanted to search for my particular camera, but I immediately get a message in the lower left corner "You do not have permission to do that." This happens in Firefox as well as in Chrome.
One way would be to go to your favorite search page and on the advanced page and put "darktable.club" in at this domain location.
I get the same message in the lower left corner. Clicking the cross does start the search. Clicking the magnifier shows the search results.
I suppose the message is for some detail in the search script.
Look like a bug in the web design, ignore the message the search should still work