You can send contact only with other app users through messages.
Open Messages Tab , all messages/conversations will appear below
Click on the existing message or create a new one, conversation screen will appear
Click on the attachment icon next to the Compose field. A pop-up will appear.
Find the contact you would like to send and click on it
The contact you selected will appear in your message thread
Click on the send icon to share it
The contact has been sent
You can share as many contacts as you wish simultaneously.