After you have completed registering your number with Signal, you can start privately messaging and calling. Your Signal contact list will show entries from your iPhone contact list who are Signal users.
To message or call a contact
- Open Signal.
- Tap on compose .
- Select a contact or input the full number of an unsaved contact and select. This opens a conversation thread with this contact.
- Tap into the area to type a new message.
- Type a message.
- Tap Send.