Hi,
Apologies for the late reply.
When you say they “won’t update,” what exactly do you mean?
The plugin works by simply adding your terms in the backend and then saving the set. Then you simply copy and paste the generated shortcode into your post or page to display it.
To change/update your terms, simply input new terms in the set and save it.
If you have trouble, check there isn’t another plugin interfering by disabling all plugins except WP Flashcard LITE and try again. If the problem isn’t there, re-enable each plugin one-by-one until you find the plugin causing the issue.
Hope that helps!