1. Add any test page to bookmark in Opera mini. For instance, visit www.google.com and add it to bookmarks.
2. Navigate to Bookmarks > Manage and select to edit the bookmark that you’ve added recently.
Save the changes. Now browse any page and use that Facebook-Like bookmarklet from the bookmark list. you should see the Facebook like button as the following screenshot.
In such a way, you can add any bookmarklet to your Opera mini/ mobile browser in mobile. Use the bookmarklet from the bookmarks list and it will go on its own way. Thanks Arpit.