How do I take a screenshot on my iPhone, iPad or iPod touch?

hold down Sleep/Wake then immediately press and release Volume up = The screen flashes white. Your device captures the entire screen and saves it as a photo.

I see no flash and no screenshots. Is there something else I could try?

hold down Sleep/Wake then immediately press and release Home = The screen flashes white. Your device captures the entire screen and saves it as a photo.

Which one is the Sleep/Wake button?

It’s that isolated button which is either at the left (iPad), at the top (e.g. iPod touch) or on the right side (e.g. iPhone 7, 8, X, 11).