You don't have to worry about getting your survey questions right first time because changing question text and question types is very easy -- you simply double click on the question in the question display area.
Furthermore, with the question definition screen open, you can move around different questions in display area by single clicking the left mouse button. Once you find the question you want to change, change the details on the screen and click the Modify button.
Also you can insert new questions on this same screen by typing in a new question and clicking the Insert button.
Don't forget to save your survey regularly by choosing File | Save from the main menu bar or clicking the toolbar button shown below.
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