Hi there,

You can refer them as listed below and disabled this settings https://take.ms/Hj0ryn. Please give them a try and see how it goes.

https://www.joomlart.com/documentation/joomla-faqs/sef-issues
https://www.templatemonster.com/help/joomla-3-x-how-to-enable-and-use-sef-urls.html

If you required any help, it would be best for you to provide us with the back end and FTP so that we can implement them for you.

I have followed the instruction by enabling the RewirteBase / in .htaccess then selected 'yes' for URL Rewriting in the site setting page but still getting errors. I would like to do it on my own but if I can't then I will provide back end and FTP access.

It seems pretty straight forward but I wonder why I'm getting "Not Found" error

Hi there,

Im not sure also and i suspected that you htaccess are not renamed correctly. Can you upload attached files and see how it goes.