To ensure the information you enter on a website is being transmitted securely:

1. Check for an SSL (Secure Sockets Layer) certificate
2. Verify the website's URL starts with https and there is a padlock symbol in the address bar.
3. Make sure the SSL certificate is valid and recent by clicking on the padlock in the address bar.
4. Do not enter sensitive information on sites without a valid SSL certificate.
5. Do not enter any confidential information such as bank account details, passwords, and credit card numbers, unless you are absolutely sure the information is being transmitted securely.