GOAL: transform http://mydomain.com/wp/url to http://mydomain.com/url,
1) in your dashboard, go to settings -> general and make sure
a) wordpress directory -> http://mydomain.com/wp
b) site address -> http://mydomain.com
2) move your index.php from subdirectory to the root (MOVE, don’t just copy)
3) edit your index.php to read
/** Loads the WordPress Environment and Template */
require(‘./wp/wp-blog-header.php’);
where “wp” is your subdirectory
4) delete any .htaccess file in the subdirectory
5) add this to your .htaccess in the root
# BEGIN WordPress
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ – [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
# END WordPress
Under this setup, your wordpress installation will be located in /wp/ directory. Visitors will visit your site using http://mydomain.com.
If you want to have a good read-up on everything so you know exactly what you’re doing, read this https://codex.wordpress.org/Giving_WordPress_Its_Own_Directory
