how to add signature confirmation to a sold item?

[e.commercedealz.com]

Im saling a Pokemon card but a want to add signature for delivery confirmation 

[jacbarcollectibles]

eBay only requires signature confirmation on items valued at $750 or more.  You would add the confirmation when you purchase the label and would have to add the fee to either your item price or shipping charge.  Keep in mind that a buyer will not expect signature confirmation for lesser valued items and may leave negative feedback for doing this.