There is a bit of a work around for this if your volunteers also have user accounts on your site. If you make the sign-ups publicly accessible and log-out of your admin account (so you are a guest user), then if you sign up for something and use the email associated with each volunteer’s user account, my plugin will assign that sign-up to that user, so then if they sign in they will be able to see and clear their own sign-ups. After you enter all your sign-ups, you can always turn back on the option to force people to login, if you don’t want the public to view & sign-up.
That’s the only way it can work right now if you are manually entering sign-ups for your volunteers, but want them to be able to see what they signed up for. Just make sure you are NOT logged in so that the sign-up gets associated with the user_id that matches the email you enter.
As far as seeing the names when you want to clear someone from a sign-up, that can be done from the admin dashboard. Go to “All Sheets” in my plugin’s menu, then click on the name of the sheet, or hover over it and click on “View Sign-Ups”, and then you can see a complete list of the sign-ups, including phone, email, and full name, and there is a “clear spot” link next to row allowing you to clear any sign-up you want.