"... the slider on the top jumps through the word list. Press Hit for words you know, this will take you to the next word. Press Miss for the words you don't - this will show the meaning of the word, and bring up the Next button. Click on it to advance to the next word.
In case you are not sure if the word is what you think it is, click on the word to reveal it's meaning, and then click on either Hit or Miss depending on whether you were right. Don't be tempted to simply press Hit now. There's no point in cheating the software - it's not a competition, and you'll be hurting your own revision later on."