Legally, the best way to obtain subtitles is to purchase the official DVD, which includes them. Freely downloadable subtitle files ( .srt ) for "Milana" are not widely available from legitimate sources and are often associated with pirated content, which is not recommended.
If you are watching on Amazon Prime Video or a smart TV web browser, you can customize the subtitle font size, color, and background opacity in your account settings to make the text easier to read against the movie's bright cinematography. Milana Kannada Movie English Subtitles