What exactly do you want to change? Please describe the desired result in more details.
Read this article – https://docs.woocommerce.com/document/editing-product-data-tabs/
You can add a custom tab here – https://prnt.sc/ztx8yy (edit a product), or in Theme Options > WooCommerce > Single product page > Tabs > Custom Tab.
What exactly text is not visible? Please provide screenshots.
Lightshot screenshot tool can be used to take screenshots and share them.
