tap "messaging" in the left sidebar to get started. you'll find four tabs:
composer — write and send new messages
sent messages — see everything you've sent, with performance stats
templates — create and manage reusable email designs
sms responses — see fan replies to your whatsapp messages (coming soon)
messaging uses a credit system — your balance shows at the top. each message you send uses credits. you can find credit details in the pricing section.