Right-click the daily K-line chart of the stock you bought, select "Investment Diary", then select "Write", and write "Buy at xxxx" in the title of the "Write Investment Diary" page. In this way, on the day when the main picture writes the investment diary, there is a red dot on the front of the K-line chart. As long as the mouse moves on it, the words "xxxx yuan purchase" will be displayed.