If the brand that you have applied to is using PayPal to issue commissions (or "Earnings"), you will need to connect your PayPal account to your ambassador account in order to receive your earnings from the brand. To connect your PayPal, you can follow the steps below:
Log in to your ambassador account here
Navigate to Settings (⚙️ icon)
Go to "Payout Settings"
Click "Add PayPal Account" and type the correct email address associated with your PayPal account
Click the "Update Email" to connect your PayPal
Please keep in mind that commission is paid to you based on a schedule that the brand you are working for decides. Your brand manager has set up a payment schedule in their account. Once your earned commissions reach their scheduled payment date, your brand manager will be able to pay them to you via PayPal (if applicable).