Adding text on a form

Adding text on a form

I need to know how to add text on a form beside the fields.
I need to add some text on the begining of a form, when I have to explain something about the form and also I need to add some text below on the form, when a new subcategory of questions will begin.

To be more clear I added two pictures when you can see with blue and red the text I need to add.

Thank you for your help.
Cosmin