For security reason, you cannot reset NinjaWPass password.
If you lose your password, you need to delete NinjaWPass configuration from the WordPress database.
Below are the quick steps to follow using phpMyAdmin.
1 - Log in, select the WordPress database and click the 'wp_options' table link.
2 - Click on the 'Search' tab.
3 - In the 'option_name' input field, enter 'ninjawp_options', then click on the 'Go' button.
4 - Delete the 'ninjawp_options' row.
5- Log in to WordPress and create a new NinjaWPass password.