Reply To: Problem with adding category to product

Hello,

Navigate to Appearance -> Themes from your WordPress dashboard. Click on the Add New button at the top of the page.
https://ibb.co/nLLJ3k6

Find the default storefront theme using the WordPress theme search option.
https://ibb.co/nLLJ3k6

Hover over the chosen theme and select Install and activate.

Best Regards.