Hi @mokmas1 , thanks for your question.
I've seen some people put their discussion post in the incorrect place. Perhaps this has happened to you also.
First of all did you put your reply in the 'write a reply' box?

Perhaps you accidentally put it in the 'Search entries or author' box.
If you did put it in the 'Write a reply' box then did you click 'Post reply' when you had finished?
If you did then something is not right within your Canvas instance. Here is a link to support at your institution Learning Technology Support for Students - Ferris State University
Sing out if you need a hand.
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