Without a model number I cannot be sure but I think that you will need to remove the bottom front service panel as shown in the first image below to access the inside of the cabinet on this model. Be sure that you
unplug the dryer
before accessing the inside of the cabinet.
Since the dryer will not run, here are some other tips that may help you resolve this problem:
Open the dryer door to see if the drum light turns on. This will verify that the dryer has electrical power. Push the door switch in with the door open to see if the light turns off, this will normally verify that the door switch is working properly. The door switch can prevent the dryer from running.
If you cannot verify that the outlet is working using the drum light, I recommend checking it directly. If you have a gas dryer, plug a small lamp or appliance into the outlet to verify that it is working. If you have an electric dryer, check the breakers for the dryer outlet to see if they are tripped. The only way to accurately check the electric dryer outlet would be to use a volt/ohm meter to measure voltage as shown in the diagram illustrated in the second image below. NOTE: You should only check this live outlet voltage yourself if you are completely confident in your technical ability to safely measure it.
If you find no problems with the outlet or the door switch, another common problem that would prevent an electric dryer from running would be the thermal fuse. This fuse is normally on the blower housing beside the thermistor or thermostat. You can view a parts list diagram for your dryer on the
website. You can check this fuse with a volt/ohm meter (with the dryer still unplugged). Remove one wire and measure the resistance across the leads of the fuse. The thermal fuse should measure near zero ohms of resistance (closed). If you measure infinite resistance (open), then the fuse is blown and would need to be replaced. NOTE: If the thermal fuse is blown, check the exhaust air duct system for a clog or restriction that could have caused the thermal fuse to blow. Check the flexible exhaust vent behind the dryer for a kink or clog. Make sure that the lint screen is clean. If you use dryer softener sheets, I recommend washing the lint screen with water and a nylon brush to clean off any softener residue that could inhibit exhaust air flow. Let the lint screen dry completely before putting it back in the dryer.
These tips may help you resolve your dryer problem. If you need more help, resubmit your question with additional details and the full model number of your Kenmore 90+ Series dryer.