Step 1: Tap on the 'PAY' button on the Metal Pay homepage to access the payment page.
Step 2: Select the person you want to send Cash to.
Step 3: Select the amount you want to pay, add a note of what the payment is for and click on the 'Pay <name>' button.
Step 4: The default choice to pay someone is with Cash. If you don't have enough funds on your active Cash balance, you'll be able to pay from your linked bank account. Click on the 'Pay <name>' button to confirm the Cash payment.
If you want to send Metal, check out this article: How do I send Metal in Metal Pay?