First of All Welcome to Spider Kerala, You can share your knowledge to the whole world and can earn cash from your posts. Since your are working with IRC, I don't want to go to the Posting guidelines and Rules. But you must follow them while posting forum topics and resources.
You mentioned that you cannot post feed back to FORM posts. Rajesh, it is Forum, not form. In your first thread also, you posted it as Form. Avoid this type of spelling errors in future. You must use proper spelling and grammer in forum posts and resources.
You can experiences this type of problem in most of the spider sites. I think you can also felt some thing like this in IRC too. If not, don't worry, I will give you the reason and solution. Most of them time once you login to the site, you can post responses to the forum posts. But sometimes, you are going to read all the posts for a quite long time after the login. In this case, when you want to post a response, it will show the Sign In option, but the online status may still show you as online. Also, you may open the new topics in new Tab or New page in your browser, in this case also, the same problem will be there. For avoiding this, you can open the page in the same page/Tab itself. If you open the page in new tab/Page and it shows you the sign In option, Just sign in once more, it will not harm to you. From then on, you will not experience this problem. Hope you understand what I said. Ask your doubts related to this as a response to this thread. Don't put more threads for the same question.