Just follow the below mention procedure to unlocking biometric data through online.
Step1. First go through the UIDAI website.
Step2. Fill the your Aadhaar number in Aadhaar number field box.
Step3. Enter the security code which pops up on the image & click on get OTP button.
Step4. The OTP will sent to the registered mobile number. Enter the OTP & verify it.
Step5. If your biometric is locked then it shows to unlock. Just click on Enable Biometric Locking button.