Text Field:
A text field is a form element which allows a recipient to enter text into your form. This would be used any time you want to allow the user the freedom to type what they want.
Click on the Text Field option, in the Forms Module. You will see the outline for the text field appearing on your document. You can position it wherever you would like. When you are ready, simply click the left mouse button to place the field. The Text Field option will remain lit up until you click it again so that you can place multiple fields at once. 
While in Edit Mode you will be able to resize the text field or move it around. 
Click here to learn more about form properties.
You can test that your Text field is configured correctly by checking it while in View Mode. 
You can copy and paste any form fields you have already configured. Right click on the field and choose Copy. 
Right click anywhere on your document and click on Paste in order to add the copied text field.
Deleting a form field:
It is really easy to delete a field. Simply make sure you are in Edit Mode and then select the field you would like to delete. Once it is active, simply press the Delete key on your keyboard. 