To log in to your Square account, start by visiting the Square website or opening the Square app on your device. Enter the email address and password associated with your account, then click "Sign In." If you've enabled two-factor authentication, you'll be prompted to enter a code sent to your mobile device or email. This added layer of security helps protect your account. If you've forgotten your password, you can click on the "Forgot Password?" link to reset it. Once logged in, you can access your dashboard, manage transactions, and use other Square features.