You have to go to on your computer. 

1. Log in with your log in name.

2. You should see a task bar on the left side of your scree - look for products box, press on it.

3. There you should see : Categories - Create New if you want to create a specific category for your product.

4. If you need to import just a couple new items to your list, you press “Create new” box and you enter all the data required for your product to show up on the list.

5. If you already have an excel or CSV file ready to upload - press Import box and follow instructions.