Something I don't understand is the insert new feature button. I choose Nostr profile but show a field to enter a title, instead of a npub.
Discussion
first you need to enter a title for your feature.
check this nice board from nostr:npub10awzknjg5r5lajnr53438ndcyjylgqsrnrtq5grs495v42qc6awsj45ys7 :
https://pinstr.app/p/npub10awzknjg5r5lajnr53438ndcyjylgqsrnrtq5grs495v42qc6awsj45ys7/Books