Problem with creating a label map

I want to train my skills in the slicer, so I decide to complete some available tutorials. I’m making this one:

Unfortunately, I get stuck on creating a label map on the T2 image. When I try to draw the prostate outline, it does not display in the screen. I use Slicer 4.11


The part of the tutorial where I get stuck:

use the segment editor module instead of the editor module which i think is depreciated now.