All you need is just to be on the Theme Editor:
- From your Shopify admin, go to Online Store > Themes.
- In Themes, click the Customize (besides Actions)
- From the Customize, click the Top Button and navigate to Product Page (Default Product - basically on any Product Page)
- You'll land on the Product Page (basically just be on any Product Page.
Other Useful Information:
Order in the Next to get it By - Removal of Shipping Estimator (Order in the Next to get it by) and More Information about Product Page - Tabs (Features & Options)
How to Change Specific Texts - Change Specific Texts in the Theme
How to Change Specific Colors - Change Specific Colors in the Theme