Notepad is an plain text editor which does not format text. You can format text with the following characteristics:
If you want to underline words, you will have to use WYSIWYG(What You See Is What You Get) Editor. These types of editors include Word Pad or Microsoft Word for example. If you have windows, your computer comes with a program called 'Word Pad' - To find it, simply go to start and type word pad
If you want to know how to make words underline in notepad? Well, if you do, you will find the answer to the question how to underline words in notepad? i will tell you and try to explain about putting underline letters and numbers in your notepad windows. the answer is very simple, in notepad, you CANNOT put underline, however, in word pad YES you can. so be sure that you can distinguish both programs.
NOTEPAD - in notepad, you can write ascii characters, they are raw characters, by raw, i mean they are not formatted. the only format text notepad allows is italic and bold.
WORDPAD - worpad allows you to format your text such as underline
If there is anything else you need to know, please let me know. I can help you. I am a genius when it comes to technical stuff like this.