Completely forgotten how or where to find how to relock the bootloader?

metricspace64

Basically want to trade in my pixel5a for a 7a but I forget how to reinstall PixelOS. Any quick links to relocking the bootloader and reinstalling pixelOS?

DaRon

here weg go: https://grapheneos.org/install/web#replacing-grapheneos-with-the-stock-os