create a calendar that blocks dates as user picks them

BJoanna informed me that I can create a calendar that blocks dates as the user picks them to prevent anyone else from picking the same day.

I finally found the APIs and created a new one. I don't understand the instructions, however. What do I do with the new key to make the calendar function the way I want it to?

[PS: Under "Days limit" in the Widget Settings, there's a typo on the second line:

"time the form us submitted" should read "time the form is submitted."]

The Date reservation widget will allow your form user to select a date and that date will be disabled for the next user.

May we know how you want your calendar to function?

We will wait for your response.

Thank you.