help Nitrogen exit with nrb mask

[hama.kili.hama]

I have 10 litre nitrogen %99 and regulater flow meter with nrb mask but when i breath nothink happening idk whats problem maybe i have some mistake ir wrong prepare anyone help me good guide to work properly thanks

 

[Painfu.Ll.suffering]

I have no experience yet but am interested... What is the connectio i cant see it correctly... I see there are 2 hose... Where arethey connected.? How did u manage to connect the nrb to the nitrogen?