how to sharpen chainsaw

How do you adjust the oiler on a Stihl model 021 Chain Saw?

I have a model 021 Stihl Chainsaw and it is not oiling properly and I need to adjust the oiling so that it disperses more oil per tank of gas. Can anyone tell me how to adjust the oiler?????? Thank you in advance. Gary

take the bar off and make sure that the hole where the bar oil comes out is not full of sawdust. also make sure that the bar hole is clean.