i received this warn over a year ago and i have not comitted an offense in over a year

is there any way it can be removed?

please lmk

i was told when i received it that if i did not commit an offense for 30 days than it would be removed

Go to your Warn Logs. There you should be able to see a Request Removal link.
For further information, take a look at this: http://forums.d2jsp.org/info.php?p=26

Go to your profile and click on warn: 20%. There should be a 'request removal' button or something.