Login to Dhan – Go to Portfolio – Under Portfolio you will get the option of e-DIS on top of stocks. If you already have a TPIN, go ahead and click on Transfer to CDSL button on the next screen, enter OTP and complete authorization. If you do not have a TPIN, you need to select the ‘Generate a TPIN’ option instead of Transfer to CDSL. Here is the detailed process along with a video

https://community.dhan.co/t/introducing-pre-authorization-for-edis/1453

Note: TPIN Authorisation will be applicable only for a day.