Once you have set up your questions that require looping, click on the "Looping" button to the right. Now click on "Add" and give your loop a name. Now select the anchor questions to define your start and end looped questions. You will need to select a list that stores the loop iterations. This list could be something like groups, customer types or brands, etc.
And your question script for the looped questions would include the SSI Script function [%LoopLabel()%] which will display the label from the iteration list you selected when defining your loop.
Try it out.