Click on the red letters to link them into words. Letters must be touching and words must be at least 3 letters long. Click the Submit Word button (or click the last letter in your word twice) to submit the word. If the first letter of your word is in the phrase you're trying to solve (at the top of the screen), it will be revealed.
If you reveal enough letters to recognize the phrase, click the Guess Phrase button for a bonus! You must guess the phrase before you run out of turns.