1. Click a contact in the Chats column, or Message on someone's profile.
2. Type in the box at the bottom of the window and press Enter to send. Shift + Enter starts a new line.

You'll see Seen under your last message when the other person has read it, and is typing… while they reply. The number in your browser tab shows how many messages you haven't read yet.

If a notice says the person has not opened the new chat yet, they will read the messages you send after their next visit to Wiply.