I completed level six and now it only flashes decorate, can't get into level seven any help?

Now you have to buy stuff to decorate your estate. Anything you buy is worth a number of Flowers. To get enough coins to buy decorations you can play the mastered levels over and over or, if you can afford it, you can buy coins but they're very expensive. You can diamonds fairly cheaply to get more energy to keep playing levels. Anyway, once you have enough decoration done to lower the Flowers number, it'll automatically open the next Chapter.