You can edit elements on your website in the Editor, accessible via the navigation bar at the top.
You can change the content within elements or drag them to another position on the page:
Changing the content in an element
Click on an element on the page to open the customization toolbar, which you can use to make changes.
Change the position of an element
Hover your mouse over an element, then click and hold on the blue rectangle and drag the element to re-position it.