How do you change temperament in the Privia Series?

[i_am_joey_jo]

I tried changing temperament but it sounded the same.
Am I supposed to press the button while pressing the temperament key and then the number of the temperament and then the base key or should I press the button and press the temperament key, release, press and select temperament, release and press again and select base key or...

Should I press the button and hit all three at the same time?  What should I do... should there be a noticeable difference when selecting meantone and werckmeister?