This is step by step how to migrate from WordPress to Blogspot:
1. Login to WordPress and go to Dashboard => Tools => Export => press Download Export File button.
2. Go to http://wordpress2blogger.appspot.com/ and submit the .xml file exported from WordPress, then you will have another .xml file downloaded.
3. Login to Blogspot and go to blog’s Settings => Import Blog => choose the .xml file processed by appspot.com => press Import Blog button.
4. Select the posts which you want to publish, and press Publish button.