See if this helps you ...
Step 1 - The panel.
Access the WordPress dashboard in your account. Look for the menu on the left side where "Settings" is written.
Go to "Blog Address (URL)" where you can determine how we want to open the blog, which is the main address to use to access your pages. Above you always use the directory address to access your account, but underneath you can choose the primary domain.
So where is "Blog Address (URL)" leave only the main address. Scroll the page and save the changes.
Step 2 - Modifying the Index.PHP File
It's going to get a little more complicated now. In the "wordpress" folder that you have installed on your hosting service, there is a file called "INDEX.PHP.You may even have it backed up on your PC.Save it and open it in Notepad to see the code- source.
There is a line that looks like this: require ('./ wp-blog-header.php');
Change it to: require ('./ wordpress / wp-blog-header.php');
Save with the same name overwriting the old file. Go back to the hosting directory and upload this file outside the "wordpress" folder in the main public folder of your domain.
Ready. Now your blog is already redirected to the main URL outside the directory.
source: br .forums.wordpress.org