You are free to remove any and all branding you wish from the admin console or the frontend. For the frontend its really simple, For the backend we ask that you keep it so that you can easily see what version number you are using for support and security reasons.

If you are looking for how to remove the "Powered by Blue Flame Forms for Joomla!" tag line then simply edit it out of the following file:

components/com_form/view/user_templates/c4ca4238a0b923820dcc509a6f75849b.php