word guessing game Flash Develop as3

There is a clue button that when clicked will give the user one correct letter out of 5 letters in the word such as apple. When they click the check button a circle under each letter will show up red for wrong and yellow for right.If a letter is wrong the user can click clue and be given one correct letter in the word apple for example.I have previously coded how to check each letter in the word and produce the colour circle underneath. I was trying similar code to try and select one letter from the word in the array(such as apple) and display it in the correct place in the textfield. However this is beyond me too!!

public function clue(event:MouseEvent):void {

                              for (var  i : uint = 0; i < 5; i++)

                              if (this["text" + i].text != currentLetter.charAt(i))

                              {

                                                            trace ("checking if equal");

                                        positionInWord = (Math.floor(Math.random() * currentWord.length));

                                        currentLetter = WordList[positionInWord];

                                        trace(currentLetter);

                                                            //need to give the user one correct letter

                                                            //["text" + i].text = currentWord.charAt(i)

                              }