To reply to a specific message in chat:

1. Open the desired chat.
2. Click “Reply” under your interlocutor's message.
3. The message you are replying to will appear above the input field as a quote.
4. Type your reply in the input field.
5. Click “Send” to send your reply with the quote.

Note: Before sending, you can cancel the quote by clicking the cross icon in the top right of the quote to reply without quoting.