You can't enter into CMOS setup, if you have forgot the password. There is no way to find the password again. But, you can remove the BIOS password using some utilities or some other ways.
Removing CMOS battery or changing the CMOS jumber settings. If you are having the older type mother board, it is enough to remove the CMOS battery from the motherboard and insert it again after some time. In case of the new mother boards, the battery charge will
persist for 3 to four days. So, it is good to change the jumber settings near the CMOS battery. For finding the CMOS jumber, refer m