Healthy extra confusion

[namechange2015]

Hi I'm trying this diet with my family & dieting in general new to me, I've downloaded the app & we're doing the 7 day free diet, tonight is homity pie. In the tips it says 'if not using cheese as healthy extra add 6 syns' what does this mean?
Thank you & please explain in very simple terms! I'm v dim with this stuff & get myself in s right twizzle with diet dos & donts.But trying

Well you get your healthy extras A and B, A being the calcium (cheese, milk, etc)
I think what the recipe is saying is that if you've used your HEA already that day, you'll need to use the cheese as syns.