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I posted a question and many people have answered it, however I cannot reply. Am I doing something wrong?
There isn't anything like a reply button/link.
Link for my post:
How to Replace a string by another in a text file
That's because, as I pointed out, you asked your first question with an unregistered account. Register that account, at which point you will be able to edit and comment on your question (among other privileges).
You can add your reply in the form of comment. There is no 'reply' button