To add a Gravity Form to an Elementor page you will want to edit your page with Elementor and click the below circled icon:
From there, you can find Gravity forms in the list or search for it. Next, you will want to click and drag the icon to where you would like to place the new form.
The Edit Gravity Form sidebar should open up after dragging it, you can choose from the Select Form dropdown to choose the name of your new form:
If this sidebar does not automatically open, you may see a grey bar where you dragged the Gravity Forms widget. When you hover over the grey bar, you should see a blue pencil icon to Edit which will open the sidebar:
The form widget will show as a grey bar until you select a form from the dropdown, once you select one the new form preview will display. After selecting a form, you can edit how the form displays under the Content Tab, adjust the look of the form under the Style Tab, or adjust other settings such as responsiveness, animations, and more under the Advanced Tab.