Alt + 0235Or you can change your keyboard to United States-International settings and type " + e. Google the instructions on how to change your keyboard settings for your specific OS.
There is a number of different Umlauts you can try: ß: Hold alt and type 0223 (On the Number Pad) ö: Hold alt and type 0246(On the Number Pad) å: Hold alt and type 0274(On the Number Pad) There...