What does "There are unapproved messages" mean in profile?

[Lemosagi Elap]

I see "There are unapproved messages" in top right corner section when I open MySQL forum. If I click on it, it takes me to my profile page. What does this mean?

I think it is related to my post. I replied to a thread several days back. I don't see my reply there. So moderator rejected it or is it still pending? And how many days does it take generally to approve/disapprove messages?

I am new to this forum. This info will be helpful in future.
Thanks.