How does open mode work for Blue-cast?

I am ready to try Blue-cast, 3rd party castable resin from Italy. I have not used a 3rd party resin before. I am looking for the very basic instructions on how to do this.
Several questions:
How do I access open mode?
Should I refill an old cartridge, or what?
Do I need a clean new tray or can I clean up one used before with another resin?

Search for their group on FaceBook.
They provide clear guides<!

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