Basics — name it, set the channel to WhatsApp, and pick your WhatsApp sender number.
Audience — choose the list. The wizard shows the recipient count and flags the 24-hour window that governs freeform messages.
Content — choose an approved template and fill its variables from contact fields, or write a freeform message if you're within the 24-hour window.
Review — confirm and save the draft, then send.
Tip
If you're reaching contacts who haven't messaged you in the last 24 hours, you'll need an approved template — so decide your content and get the template approved before you build the broadcast.