This should be pretty self-explanatory but... ... To change colour, click on any one of the colour dots under Colour Select. The black sprite with the question mark on it is the colour randomizer. Click on that to get a random colour. There are more varieties of colours in the randomizer than the colours above. The sideways clear page button clears the page. Click the eraser sprite to erase.
If there are any bugs/issues let me know.
