From your Shopify admin, go to Online Store > Themes.
Find the theme that you want to edit, and then click ... > Edit default theme content.
In the Filter items search box, enter powered. This will bring up both the Powered by Shopify and Powered by Shopify HTML boxes.
In the Powered by Shopify box, enter a single space. If your store is password-protected, then you can repeat this step for the Powered by Shopify HTML box, which appears on your store's Opening soon page.
Click Save.
Edit the theme code
If the "Powered by Shopify" message is still displayed in the footer after you update the default theme content, then you might need to modify the theme code.
From your Shopify admin, go to Online Store > Themes.
Find the theme that you want to edit, and then click ... > Edit code.
In the Sections directory, click the footer.liquid file.
Use ctrl + F on a PC or command + F on a Mac to locate the following Liquid tag and delete it: