You can edit a meal or need from your Organizer Dashboard.
Go to the Organizer Dashboard > Toggle Menu (if on mobile) > Meals > Actions > Edit
If multiple supporters are able to sign up for the same date, "Auto-select Volunteers" is likely turned off for that need. With it turned on, the first person to raise their hand for a date is automatically accepted and the date is marked as fulfilled, preventing double sign-ups. We recommend leaving this on. To check or turn it on: Organizer Dashboard > Needs (or Meals on mobile) > Actions > Edit > check "Auto-select Volunteers" > Save.