There are two ways to create a task. The first is to create the task directly in the task list. This is by far the quickest method. The second way is to use the task form.
To create a task, place your cursor in the list and just start typing in on one of the lines.
You can quickly re-assign the task to another user buy clicking the name of the currently assigned user. This will bring up a popup where you can choose the new user
Using the form is a much slower way to create tasks, but it allows you to add more details to the task Click the '+ Task' button in the tasks panel of the project view. To access this button, open a project, then click the 'Tasks' button at the top of the project and you will see the '+ Task' button.