This is how you can upload your feed to Facebook Catalog
Log into your Facebook account and enter the Catalog Manager:
Click on Create Catalog:
Select your Catalog Type:
Fill the requested info and click on Upload Product Info;Owner, Catalog Name, Website (optional).
Click on Data Sources > Add Products:
If you have a feed, click on Use Bulk Upload:
Select Scheduled feed, to update your feed on a scheduled time frame:
Copy paste the feed’s URL in the Enter URL box:
Choose how often your feed should be updated:
Give the feed a name and choose your currency.