Adding a shape:

1. From the left menu of the Editor, click Add.

2. Click on Shapes.

3. You will be presented with two sets of shapes choices: Preset and Theme. Preset shapes are standard shapes available to all themes. Theme shaoes are shapes that are optimized for the particular theme you are currently using. Select the desired shape style you want to add to your webpage. Note: you can always change the shape later. 

4. Drag and drop the newly added shape to the desired location on your web page. Click on the shape to drop it at the desired position.

5. Drag the corners of the shape to resize it to fit within the dimensions of the desired location.