Hello,
To install WordPress follow the following link.
https://www.milesweb.com/forums/how-to%27s/how-to-install-wordpress-via-plesk-9-5/ (https://www.milesweb.com/forums/how-to%27s/how-to-install-wordpress-via-plesk-9-5/)
After installing WordPress you can access it through the URL http://domain.com/directory , But If you would like to access it on http://domain.com then follow the following steps :-
1. Go inside of the WP admin to the Options / General / General Options section and changed the following:
WordPress address (URI): http://domain.com
Blog address (URI): http://domain.com
2. Moved everything in the wordpress directory to the root (httpdocs) directory via ftp.
Now you can access it on http://domain.com .
Enjoy !!!