Hi @avi15003
Welcome to the Canvas Community. There's a few ways you can do this. If the Discussions menu item is available in your course site, head there and if it is an instructor-created discussion prompt, there should be a discussion topic which--when you click on it--will automatically send you into your group's discussion page.
Otherwise, if this was something that a fellow group member started him/herself, the best way is to get into your group page first. There is a description of how to do this here: How do I view my Canvas groups as a student? Once you head into the group, you see a similar menu to your course-wide menu on the left, one of which is to Discussions and there you'll be able to reply.....or post on topic yourself, as covered here: https://community.canvaslms.com/docs/DOC-10694-421250009
I hope this helps a bit, Yris. Good luck on your studies!
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