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I am sorry to hear that your kitten is having eye troubles. At this age, the eyes may still be closed as part of the normal development but with the pus that you describe the best thing to do is to open the eye gently so that it can be flushed out. You can do this by applying gentle traction on either lid using a moistened Q-tip. You may have to work at it for a few muted but eventually you should be able to work the eyelids apart. once the eyes are open you can use regular saline flush to clean them out. It is likely that the kitten will need eye drops to treat infection so I recommend making an appointment to see your =regular veterinarian tomorrow or as soon as you can get in.