Edit Footer CSS

I read about working with the editor, child theme and so on but I am not confident enough already to do all of this to solve my problem:

I managed to hide parts of the footer. But actually I would like to edit what was written there into my companies info.
How or can I do this with css?

If not:
How Can I make the footer smaller or even delete it?

Or: how can I at least add something to the copywrite?

Hope sombody can help the greenhorn.