I have just signed up to Skritter and although I think it's a great way to practise Hanzi I can't work out an easy way to add words that I want to study. The textbook I use is A Key to Chinese Speech and Writing. I started going through the HSK list looking for the characters I want to study but this is very time-consuming. Is there no search function or a quicker way of finding the Hanzi I want?