Homepage directory fail

Hey guys,

Having some troubles here.

I’ve made a wrong move by changing my homepage URL earlier today, and ended up having 404 on all of my site pages.

After a few hours and a huge headache, I managed to get it back online, by hardcoding the values in the site (as said here http://codex.wordpress.org/Changing_The_Site_URL ==> editing wp-config.php and typing

define('WP_HOME','http://thegrop.com/2015');
define('WP_SITEURL','http://thegrop.com/2015');

Editing the functions.php didn’t do the trick so I had to hard code it (and I can’t change them in the settings tab now).

So, now, my website is back on and running, YET I used to have it at the root directory ==> http://thegrop.com ; not http://thegrop.com/2015

If I change one of the value in wp-config (WP_HOME/WP_SITEURL), I get back to my 404 and nothing works.

I tihnk I’ve to change the .htaccess files, but can’t manage to do it without having internal errors.

Please, I really need my website to be back up now !

Could anyone help?

My hierarchy is currently

Thegrop.com (ROOT FOLDER, where there is an .htaccess) where I want my website to be
/2015 (WORDPRESS FOLDER, where there is another .htaccess) where it currently is.

Thank you so much