What did you import (filename), what format is the file? How did you do the import?

Could you check on the bottom of the Bookmarks Menu for a folder named Imported Bookmarks? Then you can move (either drag and drop or cut and paste) those items to the Bookmarks Toolbar.

Probably it's easiest to use the "Library" window for this kind of operation. You can open that using either:

• "Show All Bookmarks"
• Ctrl+Shift+b

Does that work?