Here are the steps on adding products
Step 1

Click on the add product button
Step 2

Select the product type of the product you're gonna use , your product will depend on the product type in terms of distinction
Step 3
List down all the details of the product that you are going to put in the catalogue, then click next
*Remember each SKU must have different names
Step 4

This page let's you pick an image to identify the product that you're putting inside the catalogue
Press Upload and an upload box will appear
This upload box let's you easily pick pictures from your PC
After that you've selected your image, press open, and then save
After pressing save, you will now be redirected to the products list, where in you can see your products