Dividends are taxed at slab rate. If your slab rate is more than the percentage at which TDS is cut, then you have to pay the extra yourself. And you have to pay this within the advance tax deadlines, or else you will end up paying interest (at 1% per month, if I remember correctly).
Dividend incomes will be taxed as per your slab rate. TDS is deducted on dividend incomes at a flat rate of generally 10%.
You will have to report dividends income on the Quicko platform using your AIS, as all dividends are not reported in Zerodha reports. You can also refer to your Bank Account Statement and enter your dividend incomes on your platform.
Let us know if you have any further queries. Would be happy to help.