First, you need to add a signature block to your letter for proper business format. A signature block appears below your last paragraph, has a closing, and your signature over your typed name. In a business letter, your title appears directly below your typed name.
To create this, at the end of your letter, drop down two lines with one or two Enters depending on your current Style. Type “Sincerely,” and press enter 4 times to create room for a signature or emphasis for your name. Type your name as you sign it, for our example I will be “Joan Smith.”
Isn’t a typed name good enough?
A typed signature block is acceptable to recipients of most emailed letters. Sometimes you might want to use a script font to retype your name in the middle of the blank lines above the name typed in the normal font. Some script fonts are smaller, so use a bigger size for emphasis and legibility. For example here is a Freehand font in 24 point size:
Let’s say you need a “real” (actual a digital) signature. Take out a piece of plain white paper, regular 8 1/2 by 11 size white letter paper – the paper you use for a copy machine. Using a black Sharpie, create a large signature in the middle of the page. The large size will make the file more clear and legible when you resize it.
If your signature has white space around it and blocks out the text, you need to make the white space transparent. In the Picture Tools tab>Color section>click on the Color drop-down arrow. From the menu, select Set Transparent Color. Your cursor will turn into an ink pen. Using the cursor, click on the white background of your signature. The white background will turn transparent and your text will show through it. Readjust size and location of your signature if necessary.
How do I sign a PDF?

Once you save this PDF, it will automatically add “-signed copy” to the end of the name. If you have PDF editing software, such as Adobe Acrobat, editing will not work on the saved document. You will need to edit the original, before the signature was added – so don’t delete that one.