To type and sent a message in chat:
Go to ‘Chats’ tab
Enter the chat where you want to type and sent the message
Type your message in the ‘Type here’ field.
Note: In case, you don’t see the ‘Type here’ field, it means that it is only a read-only chat for you and you don’t have the permission to sent messages in that chat.
Click the ‘Sent’ icon beside the ‘Type here’ field to sent the message in the chat