Hi @alexseo,
Sorry, but I’m not quite sure what you are attempting and what is not working. Do you want the class names added to the HTML element? If you look at the second image you uploaded you can see a checkbox that will cause the class to be added. Based on the message it seems that the HTML element selected already has the task-2 class.
If you look at the code of the element, are the classes there? The DOM will truncate at a certain number of characters, so will not display all classes.
Thanks,
Bob