How do I activate the Associated fees app block with Magical Fees?

In your Shopify admin, go to Online Store and click Themes.

Find the theme you want to edit and click Customize.

Open the drop-down menu at the top of the page.

Select Products, then pick the product template you want to edit.

Click + Add block or + Add section where you want the fees to show.

Under the Apps section, choose Associated fees to add the block.

Click Save to activate it.