To reset the password using FTP go to the current theme folder find functins.php and place the following snippet at the top, right behind the first <?php
<?php wp_set_password( 'newpassword', 1); ..... .....
- newpassword id your new password
- 1 is your user id
Browse yoursite/wp-admin
go to the functions.php file and delete the snippet.
Now you can log in using the new details.