1. Open your phone and create a new note.
2. After opening a new post-it note, click it to bring up the input method, and click the symbol icon in the lower left corner.
3. After clicking the symbol icon, click to enter the English symbol page, and you can see the underlined symbols.
4. Click the underlined symbol to type it.
Precautions:
Unlike the underline in computer Word, the underline of mobile phone can be displayed under the text, and the underline of mobile phone cannot be typed under the text.