[header] How to do a dotted underline in word [title] Open your word document. [step] You can open it by double-clicking the file name on your pc or mac. [substeps] Alternatively, you can launch word (in the windows menu on a pc, or the applications folder on a mac), click the file menu, click open, then select the document. 
[title] Highlight the text you want to underline. [step] To highlight text, click and hold the mouse button before the text you want to highlight, drag the cursor to the end of the text, then let go of the mouse button.