
If it is installed then there should be a checkmark next to the name on the addon menu, also the option indicated above should be availible. I use to run it fine on a microsoft surface 7 with 2.81, but due to lag with 2.9 I kinda need more processing and it does freeze up, especially on startup even on the default cube, but it will recover in 10-20 seconds. keep in mind you simply cant draw. you must use LMB CTRL to get started.
Also if you cant get that to work there is always Bsurfaces (pictured above) not as fancy, but faster and is one of the free community addons you dont need to search for.