Hello,
Please read this article – https://woocommerce.com/document/related-products-up-sells-and-cross-sells/ Could you please record a video of the problem? What is URL of your site? Could you provide temporary wp-admin access? Create an account via Dashboard (Users > Add new) with administrator role http://prntscr.com/s3rc9m > provide us with username and password via the Private Content area http://prntscr.com/s5mao7 You can use any email for it.
Regards
