Step1. Log in to WP admin panel
Step 2.Go to the site Tools –> Export
Step 3. Choose the "All content" radio button and press the "Download Export File" button.
Step 4. After saving .xml file, install SolidOpinion plugin. Plugin installation instruction is described here.
To import WordPress comments into SolidOpinion commenting system you have to e-mail to firstname.lastname@example.org. Specify the following information in the letter:
1. shortname - the site shortname you need comments will be imported from
2. date – send date
3. filename – name of an XML file in format import_shortname_(dd-mm-yy).xml
Attach an XML file in archive with .zip extention.