Form 26AS can be downloaded 

• On the TRACES website
• Or via Net Banking Facility of authorised banks

Follow the steps in this guide: https://cleartax.in/Guide/TaxCredit

The password for opening Form 26AS will be your Date of Birth (in DDMMYYYY format)

For e.g., if your date of birth is 01-Feb-1980, password will be 01021980.