You can change any text on the website. They are under default english Shopify translation.
You will see tabs for each store section, such as header, footer, home page, pages, blog etc. Under each tab you can change text snippets across the whole store.
Step 1 – From your Shopify admin, click Online Store, then click Themes
Step 2 – Click the … button for the theme you want to customize, then click Edit language.
Step 2 – Find the text snippet you want to change by using tabs
Step 4 – Once you are done click Save.