Based on my knowledge, which is very limited, I can only tell you couple of things:
1) you need to use 4 ink cartridges for white ink
2) in your picture there is none
3) you need to configure RiP’s ink channel and define CYMK and White inks.
4) for printing you need to use with white ink print
5) based on RIP version either use 2 pass or single pass printing.
I don’t know any thing about your printer. This is what I understand about white ink.
I am telling you because in your question does not mention any thing what setup you have for printer or RIP.
I thought this may help you to research or investigate further.