How to do a digital signature

1. In Excel or Word, click the Insert tab.
2. In the Text group, double-click Signature Line. The Signature Setup dialog appears.
3. Type the needed information and select the options that you want. Click OK.
4. The Signature box appears.
5. To sign the document or spreadsheet, double-click the Signature box.
 Note   You may be prompted to save the file. Save the file.
6. The Sign dialog appears.
7. You can type your signature or click Select Image to insert a signature image file.