Step1: Choose the template and get into the builder.
Step2: 3rd last tool of the toolbar at the left corner of your page has a tool reading 'Carousel'
Step3: Click on it and the carousel will be added to your page.
Step 4: You can update the carousel according to your template with Carousel Settings button as shown in above image.
Learn more through video: https://s3-us-west-2.amazonaws.com/meetzippyandhqmeetuptokboxrecording/46351292/bb61b253-d46e-450d-8123-b41de4033eae/archive.mp4