Apparently 283 people in the last five days have googled to learn how to install actions in Photoshop Elements 6 and arrived at my blog on old posts!
So, I wanted to make sure these searchers are finding the right page for the answers to their needs.
On this page, you will find tutorials for installing plug-ins which covers every version of PSE. It not only covers actions which plug into PSE, but other plug-ins such as layer styles, patterns, brushes, gradients, swatches, shapes, and filters in both Windows XP and Vista.
However, I do not own a Mac, so the paths may be a bit different in Mac, but the concepts should be the same.
The instructions for actions are near the bottom of the tutorial.