how do you replace a lite in a sharp microwave oven? light replacement for sharp microwave

Have you tried getting the manual from their web page? I obviously don’t have the model number of your microwave but you should find it here. If however you have one of those models that has a sealed unit light (one without a lamp cover) it would be best to contact a proper repair centre as it can be extremely dangerous to open up a microwave if you don't know what you are doing.
Find the lamp cover - sometimes its outside the case, sometimes its inside. Remove cover. Unscrew lamp: fit new lamp.