Craft a beacon using 3 obsidian, 5 glass, and 1 nether star
Place the beacon on top of a solid pyramid made of iron, gold, diamond, emerald, or netherite blocks
Make sure the beacon has an unobstructed view of the sky
Right-click or use the beacon to open its menu
Insert an iron ingot, gold ingot, diamond, emerald, or netherite ingot
Select a primary power
If the pyramid is large enough, select a secondary power
Confirm the selection
Reopen the beacon to change powers later
Keep the beacon exposed to the sky for it to stay active