Go to the Extension Manager and click on the title of timtab. In the following screen select UPDATE! from the top right select box:

The UPDATE! option will be available when at least one importer was found. In the next screen you can select from the importers that were found. Select “EXT: ee_blog Import”. Now enter the database configuration and the PIDs where you want the posts, categories and comments to be stored:

Click “Configure Importer”. The next screen will show you a small statistic on what has been found. Items marked as deleted are not counted. With a final click on “IMPORT!” the import starts. That's it.