To send messages, you can go to the "Messages" section, where all your message history will be listed. If you want to send a new message to someone, all you have to do is click the "New Chat" button and enter the ID or nickname (it should be someone who is already on your contact list) and send the message. The message will be invisible to everyone but you and the intended recipient.

If you are using a work account, your colleagues registered in the system will be automatically listed in the "Company Contacts" section. You can send a message directly by selecting the relevant person from the list.