Press Select 
in the Floating Tools toolbar.
Press the interactive screen to perform a left click.
SMART Notebook 10 for Mac Operating Systems
You can use the Select tool in the Floating Tools toolbar to select (left-click).
NOTE: Press the Select button after using pen or drawing tools. Otherwise, SMART Notebook interprets your actions as pen strokes.
Press Select in the Floating Tools toolbar.
Press the interactive screen to perform a left click.