Any support on how to use Megamenu

i am using elementor, posted already in Elementor Community Facebook, but did not get any response. so hoping to get a reply here
i installed the NavMenu Addon For Elementor plugin. i do not see anywhere/any clue or documentation on how to create a simple mega menu. in Appearance, it does not give any option to create one. and in Elementor edit page, it just give the option to drag the Megamenu to a location only.
i hope we can see some documentation. i know it is free for now, but i expected some documentation, even basic on how to use the plugin. thx