Now that the WBS structure was created and your project is now divided into several stages, you can anytime modify the task type of a task if you consider that a particular task should have a different type that the rest of the tasks. Remember that at the beginning, before introducing the tasks in your project, among the general settings for your project, you could specify the default task type from Schedule section of Options dialog. (File → Options menu). This implied that all the newly inserted tasks in your project would conform to the selected task type.
Using the Task Information dialog you can refine the task type for each individual task, to better fit your scheduling needs.
1. For the previously inserted project plan, double click on the task with ID = 7 (Obtain building permits). In the opened Task Information dialog, go to Advanced tab and select Fixed Duration as task type.