To create pins from a product catalog on Pinterest, you need to follow these steps:
Go to Catalogs
Click Get Started
Click Add Data Source
Input your data source URL (URL copied from Channable)
Select the XML file format
Click Create Pins
You will then land back at the main Data Source page. Your feed is being processed - wait for a confirmation email from Pinterest for the status of your data source submission.
Note: The data feed is updated by Pinterest every 24 hours.