Open your Blogger post where you want to show your widget and change the view of the editor.
Select the HTML view.
Paste the code of your widget, and update your post. You'll see your widget on your page after that. You can click on the Preview button to check it.
Please note that the appearance of your widget may depend on your website's styles. Avoid adding your widgets to existing elements or blocks if possible. Certain features might be blocked on some platforms.