I need help to use Join Type Path effect for joining to paths.

The steps to follow.

Any example video link would be helpful

Hi. Have you seen this:

http://tavmjong.free.fr/INKSCAPE/MANUAL/html/Paths-Combining.html

and this

https://www.google.com/search?q=inkscape+joining+two+paths&client=ms-android-verizon&prmd=ivn&sxsrf=APq-WBufz7dIQxO_tMCG3CErKlVirr7-EA:1645230211117&source=lnms&tbm=vid&sa=X&ved=2ahUKEwjWp7qSwIr2AhW5SjABHVCGAqAQ_AUoAnoECAIQAg&biw=360&bih=560&dpr=2