No matter how an image was created, as long as it's found somewhere on your PC, you can stick it into your Word 2016 document. Follow these steps:
Click the mouse in your text where you want the image to appear.
Click the Insert tab; in the Illustrations group, click the Pictures button.
The Insert Picture dialog box appears.
Locate the image file on your PC's storage system.
Click to select the image.
Click the Insert button.
The image is slapped down in your document.
A nifty picture to stick at the end of a letter is your signature. Use a desktop scanner to digitize your John Hancock. Save your signature as an image file on your computer, and then follow the steps here to insert that signature picture in the proper place in your document.