@welshwisdom Ctrl+X is the key combo when you're finished editing (the key combos are listed along the bottom of the window). When you do this, it will ask if you want to save, so press the Y key to confirm. Then it will ask where you want to save the file. Depending on what instructions you're using, you should have done something like sudo nano /home/pi/mywminput, which is the path and filename for the file you're creating. If you did this, you can just press Enter when it asks you where you want to save, because you already typed the filename. If you just did sudo nano though, you'll need to type where you want the file to go into the field that comes up.
