If you'd like to display your Etsy listings within a WordPress Page or Post, you can do that with a third party plugin by following these instructions.
First, install the "Widget Shortcode" plugin:
Next, go to the Widgets page. There will be a new Widget Area called "Widget Shortcode"
Add the "Advanced Etsy Widget" to that Widget Area and configure it. Click "Save."
In the Page or Post that you'd like to place the listings in, click "Add" > "Widget Shortcode" and choose the widget you just created.