How to sign a Word document: How to add a digital signature with the help of signature line Open the Microsoft Word document and click on the place where you want to add your signature.After you draw the line, customize the color and appearance. The Shapes menu contains several line options, including lines with arrow points on one or both ends. A third way to add a line to a Word document is to draw it on the page. Use the Shapes Menu to Insert a Line in Word.It does not mean that you cannot use your ‘handwritten signature’ in word, YES you can insert signature in Word created digitally and at the same time, you can insert signature in word, written on a blank page i.e.