The plugin is located as follows: https://wordpress.org/plugins/...

You can do a LOT more with this plugin than what I've shown you here.
Example: you can bulk edit posts in a certain type and convert them to a new type with one quick action. You will need to visit the link above to find out how to do this.

UPDATE: Once you have completed your changes, you no longer need the plugin and can delete it in order to reduce the number of plugins you are using on your website.