tootskellett

You need to remove the bobbin case and clean out the lint from underneath it. (use a soft brush or pipecleaner). Then you can put One drop of sewing machine oil on the "wick". It looks like a small round spot of lint under the bobbin case. (do not pull it out) .When you replace the bobbin holder make sure that the red marks line up with each other. None of the other parts need any oil. It is suggested that you put this drop of oil on the wick when it appears to be dry. Also clean out this area quite often - e.g after 6-8 hours of sewing, and before starting a new project.
I hope this helps.