Carlos,

You will want to hide the the ".lf-poweredby-post" section in the "form.css" file.

form.css is located at "C:\Program Files\Laserfiche\Laserfiche Forms\Forms\Styles" on the server hosting the application.

Open the file, search for .lf-poweredby-post and add {display:none} right after the first result. This will hide the section underneath.