Here are the steps to add a signature in Word:

1. Open Microsoft Word.
2. Click on the "Insert" tab.
3. Click on "Signature Line" in the "Text" section.
4. Select "Microsoft Office Signature Line".
5. In the "Signature Setup" dialog box, type the needed information.
6. Click "OK".
7. Once you have added your signature, make sure you resize it as MS Word makes it full-width by default.

If you want to draw your signature instead of typing it, here are the steps:

1. Open Microsoft Word.
2. Click on the "Insert" tab.
3. Click on "Drawing".
4. Click on "Draw".
5. Select a pen.
6. Start drawing your signature.
7. Click on "Save and Close".
8. Once you have added your signature, make sure you resize it as MS Word makes it full-width by default.