Need help with rule criteria for checkbox

Need help with rule criteria for checkbox

I need help with a rule creation. I have a check box field for yes/no. I then have another field that I want displayed if the check box for yes is checked.

I understand that the criteria has to be set as true for yes. but I'm having trouble seeing where and how to set that. Under the criteria section I have selected the field name, but under the operator menu I see the choices as
EQUALS
NOT EQUAL TO
STARTS WITH
ENDS WITH
CONTAINS
DOES NOT CONTAIN

How do I set the criteria for a TRUE or FALSE? And what is the syntax for it?

I believe this would be the same for radio buttons... please let me know.

Thanks in advance.