How can I use the fonts from Font.cc

Well that really depends. Depends on what you are doing with them. All fonts can be used for personal non-commercial user without question or cause for concern. If however you plan to use them in a commercial logo or advertisement then you should first check the readme or other legal info contained in the file download.

Each artist has set his own stipulations and set of rules. Some will let you use them for anything while others will want credit, or even a nominal fee.

If you have any questions please contact the artist or if no artist info or legal info was included "Google" the font name and you will likely find the fonts owner or the owners homepage.