It is very easy to use. You register at ByHand.me and then in the upper right corner of the screen you choose New Spotlight. Then simply follow the directions on the page until you've selected your nine items you want to spotlight from the various venues. If you decide you would like the items in a different order you can just click on an item you want to move and drag it to where you want it to go. Then the two items will switch places. It is very easy and a lot of fun.
You can spotlight your items, your friends items, items that just caught your attention for any reason at all.
Once the spotlight is done it will show up in 'My Spotlights' in the upper right corner of your screen. Go there, hover over the little planet icon next to the spotlight you want to share, and a grey box will appear. At the top of the box are sizes of spotlight you can choose from (the one at the bottom of this page is the full size). Select one and the html code will appear. Then you can paste the code into a blog, a website, or whereever you want. There is even code provide for sites that don't support Java.
Simple, fun, and free what more could you want? Now go forth and Spotlight! :)