Use R111 and simply drag drop the file in the start page, it worked right away for me.
In a project where the Sprite sp1 has two different frames :
| Global number gv_sum = 0
+ System: On start of layout
-> txt1: Set text to gv_sum
+ Mouse: On Left button Clicked on sp1
----+ sp1: Pick top instance
--------+ sp1: Animation frame = 0
---------> System: Add 2 to gv_sum
--------+ System: Else
--------+ sp1: Animation frame = 1
---------> System: Add 1 to gv_sum
+ (no conditions)
-----> txt1: Set text to gv_sum
Otherwise you can also check out this tutorial to do a shooting gallery: scirra.com/arcade/tutorial-games/shooting-gallery-2252
I've checked an example and it looks to complex for me. So there is no possibility if 2 sprites one on another to define which object was clicked? So why does Event for mouse has a name "On object click" if in real it clicks everything what under this point and it can be 100 objects? May be it is good to change the name or description for this event?