How do I add a rest day?

I looked up on the Community page but the response I saw doesn't help me. Can I change a day with a scheduled workout to a rest day in FB Plus? If so, how? Today is a scheduled workout day in my program, but we are building a fence (I have been working out THEN digging holes, moving railroad ties, and setting panels). But I just need a day off today. How do I add a scheduled rest day if there is already a workout scheduled, or can I? Thanks!