To add an extra layer of security to your Instagram account, navigate to your profile and tap on the three horizontal lines (menu) in the top right corner. Select 'Settings' and then 'Security'. Here, you'll find the 'Two-Factor Authentication' option. You can choose to receive a security code via text message or use a third-party authentication app. Follow the on-screen instructions to complete the setup. This feature ensures that even if someone discovers your password, they won't be able to access your account without also having access to your phone.