Instructions for using the lasso tool

Can you please tell me the steps for using the lasso tool? I must be doing something wrong.
this is what I am doing:

  1. clicking and holding down the whole time to drag (I see it works if I don’t hold down, is there a reason to hold down or not?)
  2. If I let go, the lasso tool continues to draw and If I double click the outline I drew disappears

Sounds like what you’re using is the regular lass tool, which I personally find hard to control. Try the polygonal lasso tool and use it like you use the pen tool, just without curves. You basically have to click and “drag” around the area you want to select. Hope that helps!