On IOS, I looked under Profile settings and I don't see anywhere that you can do that. Can you give a little more explanation.
Actually, I can still change the Lightning receive URL address on profile settings nostr:npub1rxysxnjkhrmqd3ey73dp9n5y5yvyzcs64acc9g0k2epcpwwyya4spvhnp8
Discussion
tap your profile picture on the top left > press Profile > press edit profile > scroll down to the Bitcoin Lightning Address field