Typing Na'vi
Accents
For Mac
í - Option+e, i ä - Option+u, ä
For Windows
í - Achieved by holding "Alt Gr" (most commonly found to the right of the spacebar) while pressing the i key. Works for both lower and uppercase.
ä - Achieved on international keyboards by holding the 'alt' key and, using the numpad only, typing '0228'. The alt key is then released and the character will be produced.