@NievesGonzalez ...
I'm not sure what you mean by a "NSchecking button". This is the Canvas Community website, and users here can help answer general questions you may have about the Canvas LML (Learning Management System). If the "NSchecking button" is something specific to a course you are taking at your school, I'd recommend reaching out to your instructor or to your school's Online Learning / eLearning / Distance Education team. Someone there should be able to help you troubleshoot that with you. Good luck!
