To display metafields in your Shopify theme, follow these steps:

1. Log in to your Shopify account and go to the Online Store section.

2. Click on the "Actions" button next to the theme you want to edit, and then click "Edit Code".

3. In the code editor, locate the file where you want to display the metafield value. For example, if you want to display the metafield on a product page, locate the "product-template.liquid" file.

4. In the file, find the section where you want to display the metafield value. For example, if you want to display the metafield value in the product description, find the code for the product description.

5. Use the following Liquid code to display the metafield value:

   {{ product.metafields.namespace.key }}

   Replace "namespace" with the namespace of your metafield, and replace "key" with the key of your metafield.

   For example, if you have a metafield with namespace "my_metafields" and key "my_field", you would use the following code to display the value:

   {{ product.metafields.my_metafields.my_field }}

6. Save your changes and preview your store to see the metafield value displayed on your page.

Note: Make sure that the metafield is added to the product in the Shopify admin before trying to display it in your theme. You can add metafields to products by going to the product's page in the admin, scrolling down to the "Metafields" section, and adding a new metafield with the appropriate namespace and key.