Once you open a DEMAT / Trading account with HDFC Securities, then you can proceed to use the below link to login to HDFC Securities.

https://trade.hdfcsec.com

You can save a lot in brokerage, if you choose the right broker.

Click Here to open a Trading Account with "Zerodha" through us and get FREE Training on Futures and Options Trading Strategies.
Difference between DEMAT and Trading Account