To add it to a post or page, click the black plus sign and type in “little toggle” in the search field. To edit the block, see the settings in the right-hand sidebar. If you need more space, click the pencil icon on the block to switch to Edit Mode. While in Edit Mode, the settings move from the sidebar to the Block Editor. Click the eye icon to switch it back.
For each question or row, add a heading and some content. You can add more rows by clicking the Add Row button. You can change the order, too. First, to make things easier, click the top left-hand arrow to toggle the row. Next, click and hold to drag the row into a different order.