Once you have installed iPhoto, the next step is to launch it. The first time you launch iPhoto differs from subsequent launches.
Ways to launch iPhoto:
iPhoto's initial launch
The first time iPhoto ever launches, it gives you a choice of what happens when you connect your camera to your Mac (Figure 1.6). The choice you make here sets your "Hot Plug Action."
Figure 1.6. Select whether or not you want iPhoto to launch automatically when you connect your digital camera or insert a memory card into a card reader.
Hot Plug choices: