I selected Crow (show), and I got a message saying that someone else is crowing. What do I do?

This means that someone nearby is also trying to Crow.
First check with your nearby friends & family verbally to see if someone accidentally touched the Crow button instead of the View button.
If not, then you should consider setting your Crowing to private by entering a private ID. Then tell all your viewers to go to settings and set the private ID to the private ID that you entered.