Save & Load, brightness of the display

Hello, I am happy to meet you.

I am not good at English, I translate it on a translation website.

I was able to create a new PICADE, but I have some questions.

As a game controller
Save = select + right shoulder
Load = selection + left shoulder
However, it can not be done with PICADE.
what should i do?

Do I need to adjust the brightness of the display every time?
It is cleared by turning the power on / off.

There are no two clips attached to the joystick side.
Can I purchase additional items?

Answer please.

I like PICADE.