Where? Rated 4 out of 5 stars

Dont see the button anywhere.Please help.

This review is for a previous version of the add-on (3.0). 

The menu button should appear in the Navigator Toolbar, but you may otherwise find it in the Customize Toolbar. Click right on a toolbar, choose 'Customize ..', find the button and drag it to where you want to place it.
In case you have installed the experimental version which was online for one or two days, please uninstall it and download the latest version.