Step 1 : Click on Integrations tab in left menu, and then click on Add Integration button to add new integration.

Step 2 : Select Wordpress.com from the select list and click on Save Integration

Step 3 : Click on Approve button on Wordpress.com Auth Permissions Page [if you are not logged in into Wordpress.com you will be asked to login into Wordpress.com to view auth screen]

Step 4: Once you Authorize ContentLAB to access your Wordpress.com account, you will be redirected to Accounts listing page where you will be able to view the connected Wordpress.com account, this way you can add multiple Wordpress.com accounts into your contentLAB account.