Reluctant spinning

Its a Kenmore 80 series. I have the model number in the car somewhere.

Anyway, I thought I would save us some money and try to fix our dryer myself. It was making a wonderful squeaking noise so I was advised to try some belt dressing. I don’t know if it I did something while opening up the dryer or if its a case of too much dressing or something else I might have just totally screwed up but, the dryer doesn’t like to spin anymore. It will spin with a light load, and it heats and everything just fine but if we even think about putting in a full load of laundry it just sits there. Please help before my fiance disowns me for trying to be a mrs. fixit.

Please post your model number…but what kind of “belt dressing” were you told to put on???