When I draw on a graphic tablet because I paint and I tear off this feather, the colors overlap
Hello and welcome to the forum
This is a situation where a full screen screenshot (.png) would be very useful or even essential to understand your problem.
Above the box where you type your post is a line of small icons. The one that looks like a rectangle with an up-arrow coming out of it is the image upload button. You can press that, Browse for an image, select it then Upload it.