Can not add form fields

Have just purchased license Gravity forms. My first attempt at contact form is not successful.

In the instructions it says:
"On the right side of the screen is the form field toolbox.

The form field toolbox consists of an accordion interface that Allows you select two wooden field types you would like to add to your form. Thurs add a form field to your form simply click on the field you would like to add and it will be added to the bottom of your form. "

I see the form field toolbox, and can make changes to the form editor who appears on the left side.

But no matter how much I press in the form field toolbox nothing happens. Nothing is added to the bottom of my form.

Have tried in Mozilla and Chrome, no difference

Anyone?

Hi

Thanks for the great advice. I tried to follow them, step by step, but I just the same still - can not get it to work.

hi,
the edit option is deactivated in field editor interface. But the duplicate and delete option are working.

hi,
thanks for the reply, its working with twenty-ten so a theme conflict. But ..... A third party had built this website and now i am managing it. It broke after we transferred from their hosting sever to our hosting server.

yes, its a custom theme. It has 9 forms.
the link to a form http://intelliair.com/quote/