When you have downloaded the app nostr:npub12vkcxr0luzwp8e673v29eqjhrr7p9vqq8asav85swaepclllj09sylpugg you get very easy instructions from the app; but remember to paste your secret key by copying it from Damus and pasting it in the described place in nostr:npub12vkcxr0luzwp8e673v29eqjhrr7p9vqq8asav85swaepclllj09sylpugg

And don’t forget to ”follow yourself” like you follow others; it’s not needed in Damus but you need it in Primal for a better user experience for some reason!

Hope it helps you!