Before you'll be able to export & publish to a HubSpot blog, you'll need to follow a few simple steps:
Step #1: Click on Connections
Step #2: Click on the HubSpot icon
Step #3: You'll be redirected to HubSpot, where you'll be asked to authorize your Wordable connection. Simply click on Connect app and you're all set! You'll now be able to see your HubSpot connection listed under the Export Connections section.
Here's a quick video on how this process should work: