If you are a WhatsApp user, there are a few things you can do to send a message to all your contacts in the app. To start, open WhatsApp and sign in. Then, under the “Message” tab, select “Send Message.” Type out a message that is short and easy to understand. For example, “Hey everyone! I hope all is well.” Next, select the recipients you want to send the message to. To do this, click on the recipient’s name in the list of recipients and then click on the “send” button.