Hello there, @chigozie_okere Welcome to the Canvas Community. Thank you for posting your question. There are all kinds of written "how to" Guides that can answer a lot of your questions about the Canvas SpeedGrader (too many to link to in my response). But, would encourage you to check them out when you have a chance. Also, before reviewing these written Guides, you might want to review this tutorial video: . Then, if you want to know more specifics, go to the written Guides. I hope these resources will be of help to you.
(By the way, you can click on the "Guides" menu at the top of any page here in the Community, and then either choose "Canvas LMS" for the written Guides or "Videos" to watch the tutorials.)
Please let Community members know if you have any questions...thanks!