How to underline words

The method of adding an underline to a word document is as follows (take word20 19 of windows 10 system as an example):

1. Open the word document and find the text that needs to be underlined.

2. Then drag and drop with the mouse to select the text to be underlined.

3. Then click the "U" button above.

Then you can find that the text you just selected is underlined.