Make sure that all shapes are closed, otherwise you won´t find it easy to do the practice.
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The first thing you should do is to check the colour mode: If it is Indexado you won´t be able to add any colour to your picture, so change it to RGB mode (Red, Green and Blue).
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Here you have a video on how to do it (sorry it´s in spanish). If you follow the steps given you will be able to get an amazing animated gif to wish a Merry Christmas and a happy New year to everyone.
When you want to save it don´t forget to select exportar and type there what you see on this picture.