Add a New Product

Press the +Create button and then click on Product:

Next there will be a prompt that will ask for the name of the product:

Furthermore you can choose between uploading a file, or starting from scratch.

If you upload a file, make sure to select the scale of your file correctly, and in case the UV is not World Space UV then we would also strongly recommend setting that.

Once you hit Create you should be navigated to an empty Product editor.