Hey there :)
Well had switched off the comments for sometime. But have switched it on now. However, wordpress does not accept comments on older posts despite switching them on now. Its possible only with new posts after enabling the comments. So if you wish to say something on any of the older posts then just write your comments here with the title of the post followed by your comment.
Sorry about all the trouble..
Though had disabled the comments for sometime but don’t want to miss out on any of your views now :)