Flip the disposer over and unscrew the electrical cover plate on the bottom of the disposer by removing the cover plate screw. Again, be sure the power to the unit has been turned off at the electrical supply panel. Then disconnect the electrical cable connector. Pull out the wires and remove the wire nuts. Also unscrew the ground wire from the green ground screw. Be sure to save the electrical cable connector so you can use it again.
Physically remove lodged objects. If a large object has become lodged in your garbage disposal, you will need to remove it before proceeding with the cleaning process. First, it is important that you turn off the fuse that supplies power to the disposal unit. This is to ensure that it does not turn on during cleaning. Alternatively, you may be able to unplug it from under the sink, depending on the design.
Personally I'd recommend if you have a disposal have it removed. Most people don't realize, there is very little you are supposed to put in them. Whereas, they are the primary reason for your kitchen sink drain getting clogged. Just use the trash, it could save you an expensive Drain cleaning bill. Here's a tip for y'all who do have them. After use let warm water run while it's still running for 3 to 4 minutes, that will help push everything to the bigger main drain .
Place a 1/2 inch rope of plumber's putty around the drain opening in the sink. Drop the new sink flange into the drain opening and press it into place. Placing a weight, such as a disposal, on top of the sink flange will help hold the sink flange in place while mounting the sink flange to the sink. To avoid scratching your sink or the flange, place a towel between the sink surface and the weight. (See Fig 4)
If your garbage disposal is making a clicking or rattling sound, there may be some food particles that will not grind up inside. Remove power from disposer, reach into the sink hole with a pair of tongs and remove anything that is still down in the disposer. Test your disposer to be sure the noise is gone. If not continue troubleshooting your disposer issue (see below).