Hello, it is cool using ScadaBR well and already has something of customization you want.
1 - This is easy, is already built into the software, just click on "System settings" and in the upper left corner, there is a field "Description of the instance" replace "ScadaBR - 1.0 EC" for what you want;
2 - I think this will need to enter the code each page and manually remove, or perhaps replace the icon design "helps" with an image of the same size but transparent, not fully resolved, but it's an easy start;
3 - It is also possible to replace the image of the ScadaBR logo with an image of your company or institution, it is easier and interesting.