Add the tabs block
To add the Tabs by Station block:
From your Shopify admin, go to Online Store > Themes.
Find the theme that you want to edit, and then click Customize.
From the dropdown menu, select a product template.
To add tabs to an existing theme section (usually beside the images), click + Add block.
To add tabs to a new theme section (usually below the images), click + Add section.
Under Apps, click the Tabs by Station block.
Optional: click the block name to view and edit the settings.
If content is showing twice after adding the tabs block it's because the content is also being shown by a different block, most commonly the theme's default Description block.
To stop the content from showing twice, hide or remove the block that is showing the same content as the tabs.
Make sure to show the block again (or add it back in if you removed it) if you delete the Tabs app (see below).
When the Tabs app is deleted, Shopify automatically removes the Tabs block from any templates it was added to.
The block, and any content it displayed, will no longer show in your shop.
If content is missing from your shop's pages after deleting the app, edit the theme and add the appropriate block to the page.