University

You can live at home or at Uni, it shouldn't directly affect your UCAS / course application.

Or do you mean that because you wish to live at home, that you will need to change your uni / courses?

If so, I would read the FAQs on the UCAS website and act accordingly.

I’m pretty sure you can still change it. I’m not sure if UCAS still gives you the option to do so. If not, contact the admissions team for the unis and ask them to change that part of your application. It’s also never too late to change, you can still change it even after the deadline day. They should be happy to do that.