1999 Mercury Cougar How to change front rotors

Hi there.

I just change rear rotors without any problems but are now having some issues with my front rotor's.

Are these possible bolted on? I removed wheel, caliber easily but the rotor's are stuck. By eye it seems like the are bolted by the one large center bolt but the new rotors I got are not ment to be bolted on.

Hope you can help me.

Kenneth