Hi. I have tried to create an existing position by copy pasteing the FEN into the FEN creation <thing>

This won't work for me.

Can you suggest a way for me to adjust a position in my CC game without having to create the position from scratch please?

I usually use SCID and just copy the position and then paste it into the message box and then use the second FEN option which is to wrap FEN tags around selected text.

Crash