This KB article outlines the steps on how to import blog posts from Wordpress for v8 and v10. Please check your version and here.
If you have a WordPress blog you can import existing post content into your new Sitebuilder blog.
1. Click Blog
2. Click Wordpress Import
Exporting your Wordpress blog posts
If you are unsure how to export your existing Wordpress posts there is a quick guide on the importing page.
3. Select the file you would like to import and click Import
Wordpress file import