I am new to Krita and I was trying to set up my canvas and tried out a few brushes. I can't get the brushes to stop scrolling. If I try to draw a line, it keeps going and I can't get it stopped. Help me with this please.

Edit: I have been trying it again. It works fine with the mouse but it won't work with my wacom pen tablet. When I try to paint, the brushes won't stop when I try to stop it, it keeps painting and acts like it is animated. I use Linux Fedora and my tablet works fine in Gimp and MyPaint but not in Krita. I have to idea how to configure the tablet, I have never had to do that before.