At the bottom of every email from YouVersion is an unsubscribe link. Selecting that link will unsubscribe you from that specific email type and will also provide the option to manage your notification settings or unsubscribe from all emails with just one click.
For Plans with Friends emails, please open the plan and turn off the notifications
For iOS information, select link here
For Android information, select link here
For website information, select link here
If the unsubscribe link does not work as expected, please Email the Help Team and someone will be happy to assist you.