A toolbar will appear containing pen and highlighter tools, as well as a colour palette, eraser, clear all, undo and redo buttons. To move this toolbar, tap and drag it in the pink area at the bottom.
Should you wish to interact with other things on your screen, tap the Eye icon in the toolbar first. This will temporarily hide your annotations, allowing you to launch another app in the background. To show annotations again, simply tap the Eye icon.
N.B: Annotations can still be altered while they are hidden, so tapping the Undo or Clear all buttons would affect your annotations.
To close the Annotate app, tap the X at the bottom of the toolbar.