Swipe to Write mode on the toolbar to view and use the pen and highlighter then start writing.
Change pen/ highlighter tip size
Long press on either the pen or highlighter tool to change its tip size.
Change pen/ highlighter colors
You can choose from the default color palette or tap on the small arrow icon beside it to view more colors.
To customize, just long press on a color to view the color palette generator.
Remove handwritten notes by tapping on the eraser tool .