If you want to send a WhatsApp message to someone else, there are a few things you need to know. First, make sure that the phone you are using is up and running. If it isn’t, you can check for updates here. Second, open WhatsApp and sign in with your account credentials. Third, type the person’s phone number into the text field and hit send. Fourth, if the recipient is on a different continent or in a different time zone, they may not receive your message until after their next working day has passed. Finally, be sure to include a subject line that will help them know what the message is about.