To use the Level 30 boost in The Division 2, first, ensure you have access to the boost, which might come with certain editions of the game or can be purchased separately. Log into the game and go to the main menu, where you'll find an option to apply the boost.
You can choose to either create a new character or select an existing one that is below level 30. Once you select the character, follow the on-screen prompts to confirm the boost. This will instantly level your character to 30 and equip them with appropriate gear, including weapons, armor, and mods.
After boosting, you'll be ready to start the Warlords of New York expansion if you own it, or you can continue with other endgame content. Make sure to check your inventory and skills to adjust your loadout to your liking. This boost is a quick way to catch up to endgame content without the need to level up manually.