Begin by sifting you rmatcha powder through a sieve. Add your warm water and whisk until smooth, and no clumps remain (also see: ultimate matcha guide).
Next, pour matcha into your nitro canister along with milk. Be sure the mixture is not hot. Hot liquids should not be added to your nitro canister.
Charge your canister with 2 nitrogen cartridges (N2) and shake for 10-15 seconds.
Holding your canister upside down, release into a large glass cup. Enjoy!