Remove 'Powered by Shopify' from your store

1. From your Shopify admin, go to Online Store > Themes. 
2. Find the theme that you want to edit, and then click Actions > Edit languages. 
3. In the Filter translations box, type "powered". 
4. In the Powered by Shopify box, use the space bar on your keyboard to type a single space. You can repeat these steps for the Powered by Shopify HTML box, which appears on your store's "Opening soon" page if your store is password-protected. 
5. Click Save.