You do not need to submit a separate application to participate in an open market buyback. To participate, you can simply sell your shares on Kite during the buyback period. You can place the sell limit order at the buyback price announced by the company.
Under previous regulations (WEB), SEBI discontinued open market buybacks through the stock exchange on 1st April 2025. From that date, companies could only conduct buybacks through the tender offer route.
However, SEBI has recently re-introduced open market buybacks for all buyback resolutions that a company's board of directors approves on or after 1st August 2026 (WEB).
You can check the buyback details, including the offer price, on the SEBI website (WEB) and the Zerodha bulletin (WEB).