Character Map...

If your keyboard does not have keys for letters that you need to type into the Word box (e.g. you need to type the German word groß and have a US keyboard) from the Tools|Character Map menu you can click on the ß character, then click Select, Copy and then right-click and Paste the character into the Word box, or use the keystroke: Alt+0223 as shown at the bottom of the Character Map dialog below.