Just been reading your Idiots Guide to Photoshop, which initially suggested looking at your guide to layers. I followed the link to this with the red and blue blob with green tick etc. and understood that.
However, feel a bit dumb because it then said if layers icon not showing in bottom corner, go to Windows menu and select either layers or press F7. Do I have to have Photoshop open and is it there where layers option should be visible? Also is this for Adobe Photoshop?
Also below why does it ask what is 3 + 3?