It's very likely that your heating element is shorted and will need to be replaced. Unplug the dryer and remove the lower front panel. There are 2 spring clips between the upper front panel and the lower front panel. Use a flat screwdriver and slide it over these clips and then pry these clips down to unclip them so that you can hinge the bottom panel down and then off. The heating element is in the bottom right corner inside the silver heating canister. There is one screw coming in from the left holding the element inside the canister. Remove the screw and remove the front panel of the heating canister. Disconnect the wires to the element and then the element will pull straight out. Here is a link to the part.
http://www.repairclinic.com/PartDetail/Heating-Element-Assembly/3387747/525502
