Firefox toolbar
The easiest way to add an item is using a toolbar. First of all, you need to register a (free) account and sign in. Secondly, download the Firefox toolbar and click the 'Dumpti'-button. Unfortunately, we haven't gotten around to implement this function in the IE toolbar or any other browser.
Manually (& IE toolbar)
We highly recommend you use the Firefox toolbar to add items because this will save you a lot of time (even if you don't use Firefox as your default browser).
To add an item manually you need to create a screenshot (check Google) and upload it here. The rest will be made clear from there on.