1. View your product catalogue.
2. Follow the import product data rules.
3. Click on (M) Choose File button to import the CSV file into product catalogue. If first line is header in the CSV, check the (N) box.
   
4. Click on (O) Import Products and your products will be imported into the product catalogue.

TIP: You can export the product catalogue first, then edit the same CSV file to add new products or update existing products and import into your product catalogue.