Glad to hear that you've cracked it now Timothy, and glad that I could be of help.

Regarding Medium's info that says you can't edit an existing story (font-wise) - I see where they are coming from - but there is a way (I think). Here's what I would try if it were my existing story that needed new fonts:

Assuming that I had edited my choice of font (as per my previous email) I would open the original story; highlight the entire document; click 'copy' (to save it automatically on your computer); then, put the story into edit mode (by clicking the three dots at top-right and selecting 'edit'); then highlight the whole document again and now, right-click & paste the info you copied.

If you have (already) changed your medium font size, then the copied info should 'appear' in the new font you chose.

If that doesn't work - I'm totally wrong - and I apologize.

I try Timothy, I try!

Your Medium friend,

Fred