To log in to your Square account, start by visiting the official Square website. In the top right corner of the homepage, click on the "Sign In" button. You will be directed to the login page, where you need to enter your registered email address and password. If you have two-factor authentication enabled, you may be prompted to enter a verification code sent to your mobile device. Once you've entered your credentials, click "Sign In" to access your Square dashboard, where you can manage your payments, transactions, and account settings.