Use the pencil to draw and the magic wand to erase. Click the lightening button to erase the whole screen. Press the colour buttons to change the colour and the pencil to reset the colour back to black. Press the + button to increase the size of the paint and - to decrease the size.
Credit to Udemy for the tutorial A like and a love would be very much appreciated! Check out my studio: https://scratch.mit.edu/studios/32914524