Permalinks Custom Structure Error

Hello,

I am new to WordPress and I have just installed it in my hosting in a folder called https://www.mysite.com/blog

When the Permalinks are set as “Default” I can see my site fine but when I change them to “Custom Structure” /%postname% I get the error message “The page cannot be found”

I was told that I need to add a “.htaccess” to fix this. I created a file called “.htaccess” with this text

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>
# END WordPress

and I still can’t see my blog with pretty permalinks.

Does anyone know how to fix this.

Thank you very much for your help and I really appreciate your time.

MK