Just keep at it--find a picture you like on the site, repin it into one of your folders, and then you can keep track of interesting items, recipes, DIY tips, funny pics, etc. You can also pin your own findings from pretty much any website--so, right now I am using it to pin together lots of DIY Christmas decoration instruction sites, so I have them all available in one place. It is kinda like using the "Favorites" option in my browser, but instead with Pinterest I can see everything in a picture thumbnail & access it very easily.
It is pretty cool--I have NEVER known my style before, but now, by pinning various fashion and home decor items I have FINALLY seen a trend emerging and when I finally have a budget to start redoing our home, I will have tons of examples of what I'd like to see in my home.
Hope this helps!