Hi Kishor, that link is the exact same as mine. The add-on is written so you can add your own widgets to a dictionary and then they are available for reuse in any file.
When you have more than 3 (or 5 – I can’t remember off the top of my head) the add-on will display them as a drop down list.
There is an update coming shortly which will include more widgets by default (and some other fixes) but that is probably a couple of weeks away.