How can I edit different parts of a form?

In order to edit your form, you need to select it first in the My Forms. Once selected, click the "Edit Form".

In the Form Builder, you need to click the actual fields in order to delete, update text, change position, or customize it. Please check this GIF animation.

Please check this helpful guides:
How-to-Position-Fields-in-JotForm
Form-Field-Positioning
Create+Forms Guide Section

Let us know if you have any questions. Thank you.