Move the caret to the right of the letter. Now hit the down arrow key. An accent should appear over the letter. Use the same mechanism to convert the n to ñ.
Checking The Answer
Hit the Enter key after typing in your answer. Next to the text box you should be told whether the answer was correct and the what the correct answer is.
Translations and Defintions
Placing the cursor over underlined words allows you to see the definition of that word. Placing the cursor over underlined punctuation marks allows you to see the translation of that sentence.