why not try and use that one plugin (which one exactly is it?)?
generally, read:
https://codex.wordpress.org/Function_Reference/add_post_type_support#Example
the code would go into functions.php of your (child) theme.
this would add the ‘excerpt‘ field to the ‘edit‘ page for static pages (you might need to use ‘screen options‘ to enable the field first)
what theme are you using?
Many thanks for the helpful reply – the plugin I was looking at came with a warning that it hadn’t been updated recently enough to be secure, so I was taking it more as a promising sign that solutions were out there, than as useful in itself.
I’m using the Genesis Executive Pro theme – I should also say I’m very new to this – I’ve been editing websites and hiring developers for years, but this is my first go at putting together something basic from scratch for a friend (it’s: http://admiraltybar.org/).
I’ve found functions.php for the theme – do I just dump the extra bit of code at the bottom and save it, or does it need to go anywhere special?
And if it’s not overloading you with questions – where should I go to override the default font? It would be good to try some other options…. Thanks again.