How to do BTST trading in Zerodha

Hello, I am new trader. How to do BTST - CNC.
If I don’t have equity in my account is that possible to sell next day morning?.pl suggest method to do BTST.

Place a BUY CNC order today. Place a SELL CNC order tomorrow.

Yes. If you have bought it the previous trading day.

BUY Today, SELL Tomorrow in CNC = BTST