your profile is not clear:
Macbook Air, has OSX which version?
iOS8.3 is the OS of an iPad/iPhone.
I suppose you want to trash one or more photos in iPhoto:
you do that in iPhoto, but remember that iPhoto has its own trashbin, so it you wish it gone forever, you also have to empty that trashbin in iPhoto.
I do not know what you mean by How to restore Iphoto
explain that please.
Lex