In the picture you can see the parameter does not show up as a variable in the my blocks define for Heading_Change. However, you can see to the right that the may blocks was defined to input a parameter in Heading_Change?
I closed the Vexcode IQ and restarted the program. It came up right after restarting the program.
Alright, that is good! Good luck for your next tournament, assuming that it is either regionals or worlds.