Put oil along all pleats, including those at the front/top. Depending on what oil kit you have, if its the same as the K&N, just spray down the pleats, making sure each one gets some oil. Do not go around and around, only make one pass. Remember that one spray will do multiple pleats. I suggest you do a test spray onto some paper so that you know how wide the spray pattern is
If you think you have over oiled it, wash it off and start again. Recharge kit is cheap, MAFs are not