To underscore a web address, it's fairly easy. Type in the very first part of the preferred email address. This would be 'Example.' Then, look next to the 'o' button your keyboard. There are two dashes here. Hold the shift key, and push that button. This will put an underscore there. Then, type in the rest of the email address. It might be the person's last name, then the email domain. This might be @hotmail.com, or even @yahoo.com. It should look something like this: Example_Name@hotmail.com.