Click “Edit with Elementor” or “Edit Landing page” from the top admin nav. If you’re looking for this from the dashboard side, you have to go to left dash nav, look just below Elementor to find Templates > Landing Pages
Add an elementor block from the small grid icon at the top right of the left flyout editing panel.
Type in “code” when you’re searching for the block, and you’ll get options for embedding into the page.