Julio, if your bookmarks are in opera link, you need to export them from opera 12.x and then import them into the new version of opera that you are using. If you don't have opera 12.x, I think you can still get at the bookmarks through a web interface to opera link, although I've never tried to do that.
I've just been evaluating Opera 30 and I'm incredibly disappointed. There are so many features missing - bookmarks button, home page button, search box, ability to customise the toolbar, open in new/background window. I hate opera 30, and I can no longer use 12.17 because it won't work with most interactive websites. So I'm considering going to chrome, even though I don't really like it (hard to access closed tabs, and ctrl-tab works differently).
So annoying that browsers in general seem to be going backwards in features. How anyone could think that this is a good idea is beyond me.