How to add family members to iCloud Family Sharing account
Add family members to iCloud family sharing account
[Re-Titled by Moderator]
iPhone 14 Pro, iOS 17
It sounds like you're trying to add Family Members to your Family Sharing. The following resources below should be able to assist you with that but if you're having any issues let me know and someone will respond :)
Add a member to a Family Sharing group on iPhone – Apple Support (UK)
Set up Family Sharing – Apple Support (UK)