How do I block a website manually?

Hello CasiBK,
 
Welcome to the Webroot Community,
 
Unfortunately, there is no way to mark a website as unwanted or to block it from within WSA. The way that the funcntionality works at present is that should you visit a website that WSA deems to be dangerous, potentially malicious or of questionable reputation then it will throw up a block page givingthe option to avoid the site or conversely to learn more and even whitellist the site locally if one sees that the block is unwarranted/the site is safe.
 
But no way to mark a site, from within WSA, as bad or not to be accessed.
 
You could be having a PUA that causes this popup. Please look at this KB article here
 
I would also add a good free Ad Blocker like the ones suggested below:
 
For Internet Explorer Ad Block Plus: https://adblockplus.org/
 
For Firefox uBlock Origin: https://addons.mozilla.org/en-US/firefox/addon/ublock-origin/?src=ss or Privacy Badger: https://addons.mozilla.org/en-us/firefox/addon/privacy-badger-firefox/

 
Google Chrome uBlock Origin: https://chrome.google.com/webstore/detail/ublock-origin/cjpalhdlnbpafiamejdnhcphjbkeiagm?hl=en or Privacy Badger: https://chrome.google.com/webstore/detail/privacy-badger/pkehgijcmpdhfbdbbnkijodmdjhbjlgp
 
Hope this helps?