How to draw lines in the mobile phone?

Open any page, open the input window, click the symbol, find the underline, and then click it. Here, taking Xiaomi mobile phone as an example, the specific operation method is introduced for reference:

1. First open the note-taking function, and then click the+sign in the lower right corner, as shown in the figure.

2. Click on the blank space to bring up the input window, and then click on the symbol in the lower left corner, as shown.

3. Drag the menu on the left, select English, and find the underline in the English list, as shown.

4. Finally, click the underline.