You can activate your FASTag by following these simple steps:

1. Go to "My Orders" section of your Paytm App once your FASTag is delivered to you
2. Go to "Shopping" tab and click on your FASTag order details
3. You will see an "Activate Now" button
4. Enter the ID mentioned below the barcode on the FASTag you have received
5. Upload your vehicle RC copy following the instructions
6. Post document upload, you will see the following success message " Your FASTag ID is activated, Now you can use it" on your screen

Please refer below YouTube video tutorial on Paytm FASTag Activation.