Select the trait you want to change. When you click it, it should turn red, and you can use the arrow keys to change it. Click the next trait and repeat. Then, if you're done, click next. Now you can click a "change" button, and type in what you want it to say. Repeat. When you finish, click "done" and you can use your computer's screenshot button to save your new kitty (if you don't know where this is, look it up. It's different on each computer model).