Text messages

[Geho]

I have a 2016 model. My phone is linked ok in that the phone calls work and text messages are received and able to be read on the central display. But  the stored text messages are not the replies I like or require. I would like to change them but after asking Mr Google I am stuck. I think I have to use the USB in the centre console with the  replies I want in .txt format. 

Can someone tell me how - by pressing which buttons ( and does the ignition have to be on) I can over write the original text messages with my choice of answers/ replies?

Thanks

[Geho]

So 6 months after asking, 800+ looking at it, 0 replies I eventually got to the local Ford dealer and asked for help. It took 2 minutes and not the answer I wanted. The preloaded text answers cannot be changed. So the text answers that are useless I am stuck with and therefore it is back to my ear piece and 'spoken' texts. To my mind a big error that I did not realise when  I got the car. Oh well live and learn.

[Ford18]

I can mention something concerning text messages. I was using those standard ones which were causing some amusement to receivers but then ditched that Android phone and 'upgraded' to an iPhone as 'everyone' was telling me to do this -- nothing to do with the car usage whatsoever.

Now, I know that iPhone text messages do not connect with the SYNC3 system at all, so I have gone further back.

Unless someone can instruct me how to connect an iPhone text messages ?  -- as a 'phone', in the car, it is fine.

Up to last October I had a 16 reg Ecosport without SYNC3 and the iphone texts didn't work in that either.