Open Cookie Run: Kingdom
Go to the Gnome Laboratory
Check the upgrade or research that requires Gnome Dust
Make sure you have enough Gnome Dust in your inventory
Tap the research or upgrade you want to complete
Confirm the action to spend the Gnome Dust
Use Gnome Dust only for Gnome Laboratory upgrades and related progression tasks
Earn more Gnome Dust from events, rewards, and game progression if needed