Once you've used the 'quote' response Cathy just make sure you keep the 'code' at the beginning and end of the quoted text complete. You can edit the text between the 'quote' codes just make sure you then put your response below the bottom [/quote]. Aside from identifying the author of the post you're responding to it will also notify them that you have responded. I trust this makes sense.
I know it can be a bit awkward editing the text on a smartphone as I use one