Install Customiser on a Product or Page on your Shopify Storefront - App Blocks
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This guide will explain how to add the Sign Customiser to either a page or a product page in Shopify.
Step 1: Create a Custom Template
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From your Shopify admin, go to Online Store > Themes.
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Click on Customise to open the theme editor.
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In the top dropdown menu, select either:
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Page > Create template (for adding the customiser to a page), or
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Product > Create Template (for adding the customiser to a product page)
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Click Create Template and give an appropriate name for your template (e.g. Custom Sign template).
Step 2: Add the Sign Customiser Section
Whether you want to add to a product or page template, the steps for adding the customiser are the same.
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In the theme editor, under the Template section, click Add Section.

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Click on the Apps tab and select Sign Customiser.

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Click on the Sign Customiser section to configure its settings:
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Sign Customiser ID: Enter your customiser ID (Need help finding your customiser ID? Follow our Find your Sign Customiser ID guide).
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Formatting: By default, the app follows your theme’s formatting. Use this option to force RTL formatting if needed.
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Click Save.
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By default, the customiser matches the page width set in your theme. To make it full-width, click the App section containing the Sign Customiser app.

Uncheck Make section margins the same as theme option.
Step 3: Assign the Template
Once your template is ready, the final step is to create a page or product and assign the template to it.
If Adding to a Page
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Go to Online Store > Pages and click Add Page.
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Enter a page title.
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Under Template, select the template you created.
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Click Save.
If Adding to a Product
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Go to Products and click Add Product.
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Enter a product title.
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Uncheck:
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Charge tax on this product
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Track quantity
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This is a physical product
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Set a default price to avoid zero-priced orders. See: Troubleshooting Zero-Amount Products Purchased on Shopify.
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Set the product status to Active.
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Under Theme Template, select the template you created.
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Click Save.
You are all done! Your Sign Customiser is now live on your storefront.