Step1: Choose the template and get into builder.
Step2: Click over the block where you want to insert the shapes.
Step3: 2nd tool of the toolbar at the left corner of your page reads 'Shapes'. Click on it and you will be provided with the shape options at the right side of your page.
Step4: Choose the shape you want to insert and shape will be inserted on your page.
Step5: To manage the shape settings, click once on your shape and a toolbar will appear at the right corner of the page to manage your shape settings. Click the second tool which reads settings.