When I open a form in Option B there is a message in the header area that says "Warning: Macros are Disabled". What should I do?

You should enable macros. See Changing the Macro Security Setting in Excel and Enabling Macros for more information. The software does not work correctly without macros enabled. Information from the Registration form that identifies the business or applicator will not be copied to the worksheet and many of the user-assistive features will be unavailable.