Hello Winona,
Yes, Slam-it does work with Chrome really well. So make sure you have your bookmarks bar enabled, and then just drag 'er up there. ;-) Then whenever you are visiting an eBay item page, just click the icon.
Or, you can just put it in your bookmarks menu, not the navbar... if you prefer not to enable the bar. Since Slam-it is really just a bookmark.
Does that help? If not let me know and we can help further. ;)
bidslammer