If you have not submitted POA with Choice, then also you can sell your shares by doing EDIS or Sell Authorize from Choice Web/App from Holding section. You will need to Generate the TPIN  or Enter the TPIN, post that you will need to enter the OTP and select the shares which you want to shares and proceed with this. But this activity of Sell Authorize or EDIS is valid for one day only. If you want to sell your shares everyday, you will need to perform this everyday or else you submit POA form with Choice by contacting us through support. 

https://finx.choiceindia.com/support