unable to change pattern color

[mumblingsofkashif]

hy guys I have been practising and I hit a roadblock.... image is attached I am unable to change the pattern color to yellow Can someone help me? I have tried YouTube already 

[c.pfaffenbichler]

Could you please provide the layered file or at least post screenshots with the pertinent Panels (Toolbar, Layers, Options Bar, …) visible? 

What are you talking about exactly – the »4 pizzas«, something else, …? 

What exactly is the pattern – a Solid Fill Pattern Layer, a plain pixel Layer, a Pattern Overlay Layer Style on whatever, …?