Fast Message for Gear S2/S3/Sport and G.Watch

Settings. Enable this App in order to receive notifications. Using the App. Select the Fast Message App in your Gear and if you have some stored contacts, select the one you want to send a new WhatsaApp and tap on it to get some options, like Voice Input, Keyboard or predefined answers. Confirm the message and that's it. How do I get the contact list?