You need not to permanently ask why you dont get responses, not all people watch the forum 24/7 so it may take a day or two.

For editing text you have the choice to either use inkey, thats a predefined simple editor, or to use inchar, then you can write the editing functions yourself in lite-C. For instance you can check the last key and then delete or insert characters or move a cursor character and so on.

But if you want to edit the text like in a text editor then you need a Windows Editbox. Thats using the Windows API and you can probably get better info on a Windows forum, at least I have not yet used a Windows Editbox. If its MFC you probably need to write a plugin, if its not MFC you can probably still do it in lite-C.