When navigating the Small Web portal, clicking the "flag" button on the top bar will return a 404.
URL: https://kagi.com/smallweb/flag_content?url=[URL_REDACTED]
"Not Found
The requested URL was not found on the server. If you entered the URL manually please check your spelling and try again."
I would expect a context to pop up that allows me to flag a site with a dropdown for selecting the reason, I guess.