Hi Jea738,
I am new here as well.
Nonetheless, here is what I discovered:
Go toward the bottom of your product page and ensure that in the Product Data section it is selected on "Variable Product" (See Attached Images).
Select the "Variations" tab within the left column and it will bring up another screen that shows all the countries that have been imported with the product item.
From there you can simply select and remove the country.
However, I will caution you to NOT just change the name from China to USA for example because that is going to break the image and confuse things. I did that before and it was a mess. I was trying to save time rather than remove the ones that are actually associated with the product regarding the color.
Now with that being said, if you don't have a large variation you can consider just adding the product yourself using the vendor's images which are already in your media library. Then you can give it your own name and colors. For instance if you are dropshipping a white iPhone cover that is actually ivory in color, you can change the name from the vendor's "White" description to "Ivory" and that is what will show up on your product page.
I hope this helps you