Step 1: In the Admin section select Incident Forms on the left 

Step 2: As you can see there is 6 forms. To edit the form, select the edit button beside the form. 

Step 3:  Your form may look like this. Now begin to edit it using the same function as you used to create. Select edit section. 

Step 4: Change section name, select Update Section when done

Step 5: Now edit the question or field by clicking edit questionnaire

Step 6: Edit your questions & areas of information. Edit your options, set fields as required.  Once done select Update Field.