PrintNow has a Blog CMS built into our Print Store so check it out. You can access it under Stores/Pages/Blog CMS.
If you want to use a 3rd party blog hosted elsewhere then it would be possible for one or the following:
- Add a link in your navigation to the blog using a subdomain for instance.
- The Blog provider may be able to publish its articles as RSS. You can add the RSS feed to your site in the skins area in PrintNow and keep them on the same domain this way.