1.Click Green Flag 2.Button in bottom right changes between Safe and Draw mode. Safe = Can't Draw or change colour. Draw = Can Draw and change colour. 3.If your paintbrush changes into a eyedropper then that means you are selecting a colour rather than drawing. 4.Change Pen Size with the slider. 5.Click clear to clear the whole picture. 6.Press space when over your picture to get that colour. 7.Click fill to fill the entire drawing with the current colour.
When you select a colour it might be ghostly so if you want a solid colour just click a darker shade and it should be less ghostly. It might take long to pick a colour so if it does you can download it and it takes less than a second for each colour pick.