Open up iPhoto and then select a single picture or a group of pictures which you wish to add keywords to. Select multiple images by holding the Shift or Cmd keys.
Click on the Info button at the bottom of the interface and then click into the Keywords section in the panel that appears. Begin typing your first keyword and then hit the Return key.
Repeat this process for each picture or batch of pictures until you have your library labelled and ready for searching. Keep a range of general and specific keywords to pull decent results.
Use the search field at the bottom of the interface to test your keywording skills. Type in one of the keywords you have used and watch as iPhoto finds the relevant pictures.
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