Flange is crack where the bolt is place,the toilet is unsecured. I need help with replacing the flange. I find out that its not bolted down and I am lose in how to disassemble it. Could anyone help out

Can you post a picture? Most flanges can be repaired but some need replacing, all need to be secured to the floor. http://www.youtube.com/watch?v=2jl3P7sjxCk skip the ad by clicking

Get a repair flange at HD or Lowe's, put it over the broken one, screw the flange to the floor and bolt the toilet to the new flange. $6