You can see "Post a Comment" text below your post (As in my case) or above your comment form in blogger. If you like to replace this "Post a Comment" text with your own creative text follow the steps below.
1.Login to your blogger dashboard --> layout ---> Edit HTML
2.Click on "Expand Widget Templates".
3.Scroll down to where you see this:
Note: You can find above code in 2 places while editing template.
4.Now replace above codes with your own text. For example you can replace it with "Give Your Feedbacks", or "Hey! Leave Me a Message", etc.
5.Now save your template and you are done. Refresh your site to see result.