Sending bitcoin to your own external wallet address is done via the 'Send Bitcoin' feature. To send Bitcoin:
1. Open your Bitcoin account by tapping the orange 'Bitcoin card' on the dashboard.
2. Tap 'send' up the top right. (blue button)
3. Read terms on waiting periods for sending BTC, and tap 'I understand' if you wish to proceed
4. Select 'Transfer once'
5. Enter the amount and confirm BTC wallet address then tap 'Preview'
6. Once you confirm the details of your BTC withdrawal, Swipe right to confirm
Note: There is a 0.0003 BTC (30,000 sats) fee on all BTC sends.