To activate WhatsApp as a channel on your account, click on the WhatsApp card under Channels on the Products & Services tab. Click on the '+Activate channel' button. This will add WhatsApp as a channel under the My Workspace tab.
Clicking on the WhatsApp card in My Workspace opens your WhatsApp channel management page.
From here, you can:
Create new and manage your existing WhatsApp accounts
Create new and manage your existing WhatsApp Business Profiles
Add new and manage existing WhatsApp (HSM) templates
Access a test profile and test templates to use while awaiting approval
For more details on each of these topics, see the rest of the WhatsApp section in this user guide.