That's a great question! I apologize you were unable to see this option to send your email to a segment of contacts This is a feature only available in our newest Third-Generation Editor, Newsletter Emails. I took a peek at your account and can see you are working in our older Legacy Newsletter Emails.
You can post a new message in the Community or find us on Twitter Mon-Fri 8am-8pm ET, Sat 10am-8pm ET, & Sun 10am-6pm ET. We've got real people waiting to help you out. Click below to start a conversation!