I think that I successfully added a German keyboard to my input options. (There's a little flag. I can change it from US to Germany, and the keyboard does change. However, even after I switch to the German keyboard, I can't figure out how to type letters with umlauts. Option-s gives me ß, but option-a gives me å, option-o gives me ø, and option-u gives me ¨.
I tried option-everything and none of them were umlauted.
What am I not doing right?
Edit: Solved! Thanks, everyone.