If you're using a PC, there's a button somewhere at the parte superior, arriba right coorner that reads "PRT SCR" o "PRT SC" o something similar.
Press that and tu should see your cursor blink.
Open paint o something similar
right click --> paste
Or
editar --> paste
Resize as needed
file --> save as
If you're using a Mac,
link.
I don't use a Mac, so all the information there goes over my head.
