The only installation you need to accomplish to use the product is the bookmarklet, which is found on this page.
Once it's installed, you've got everything you need to start stacking. Any time you see a chart, an article, or anything else you might think be helpful to the community, just click the SocialTrade bookmarklet and choose whatever stacks (one or more) you think are appropriate. Your page will instantly be added to the stack or stacks you selected for all to see!
You probably want to start choosing stacks to follow by checking out the Category page and the SocialTraders page. Click the Follow button for any stacks or SocialTraders who pages you want to follow.
From then on, you can catch up on what's new by looking at your Followed Stacks page. Of course, it's sometimes fun to check out the most recent pages that have been stacked, just to see if there is someone else putting up interesting pages you'd like to follow.
That's really all there is to it! Have fun, and good luck in your trading!