You can add an element to a page in two places.
The first, shown below, adds an element to the outer most section of the page.
The second nests an element inside of the element above it.
Nesting allows you to structure you page as well as position elements on the screen. You can use Elements nested inside Sections to position the Elements. If you give the outer section a display of Flex, you can use "Direction", "Align Items", and "Justify Content".