Families are only available in the personal or business licence and not in the free version Im afraid.
Make a variable that checks if the note is on screen, for example:
0 - for no, 1 for yes (or you can set up a boolean under object instance varaibles, in the left panel once you select a sprite)
If Note_Spawned=0 ---> spawn object note at x,y (as in the post above), set variable Note_Spawned=1
If note is not on screen ---> set Note_spawned=0
(this is to terminate the note, and once terminated allow another note to be spawned)