I want to add a button in text editor so that by pressing the button, it will automatically post a specific text inside the text editor, by this way, users wont have to write "Salam A likum" before starting every post, one can just hit the button above and this should be printed on the editor.
Stencil will make it appear on every new thread automatically? I want users to choose when they want to put it or not by a button. How will it be possble?
The modification Wayne linked to will allow your members to create pre-defined responses/text that they can add to the post with a click. That is what you wanted, no?