To remove the 'Ship From' attribute on your product page/s, from the store dashboard go to:
> Products > All Products

From within this page find the 'Product' you'd like to 'Edit' by either scrolling through or searching for it via the search box in the top right:

Once you've found the product you'd like to edit, hover over the product with your cursor and click 'Edit':

When the next page opens up, scroll right the way down to the heading 'Product Details':

Click the 'Attributes' tab on the left hand side:

Find the 'Ship From' attribute within the 'Attributes' tab and click it's corresponding 'X' to the far right:

(*Don't forget to click 'Update' at the top of the page after making alterations*)