How do I fix a flat tire on my Ford Focus?

I was driving my Ford Focus today when I suddenly got a flat tire. I'm not sure what to do now, can someone please give me some advice on how to fix it?

First, make sure to pull over safely and turn on your hazard lights. Then, locate your spare tire, jack, and lug wrench in the trunk of your Ford Focus.

Next, use the lug wrench to loosen the lug nuts on the flat tire, but do not remove them completely yet.