The Opera browser imports bookmarks automatically during the installation process. In this option was disabled during the app installation you can import bookmarks subsequently as described below.
- Click the Opera icon in the top left corner of the browser window.
- Select Bookmarks → Import bookmarks and settings…
- Once the bookmarks importer opens, select from the drop-down menu the browser from which you want to import the bookmarks.
- Checkmark the items you want to import.
- Click Import.