Remove “Quantity” and “Items you are bringing” from reminder emails

Please read the documentation:
https://stephensherrardplugins.com/docs/pta-volunteer-sign-up-sheets-documentation/
You can put whatever you want in the email templates. Go to the settings, then the email settings tab, and edit the templates for the various emails to say exactly what you want, and add/remove the template tags for what you want to show.