First of all, you will need to ensure you have Elementor already installed on your website.
To edit with Elementor, please go to Dashboard > Page .
You will see a screen similar to the one below. Hover on the page that you want to edit directly, if you have already edited it with Elementor then you can click on the “Edit with Elementor” option that appears on hover.
If you cannot find Edit with Elementor, click on the page that you want to edit directly then you will find that option in the top of the editor.
Once Elementor loads, you will be able to edit anything on the page using the Elementor Editor.