If you want to remove it by yourself, you should put rewetting drops in the eye before you start to remove the lens and then wait several minutes. Then put one finger on your upper eyelid and the thumb on the lower eyelid and try to blink your contact lens out of your eye. Or you can go to see your doctor and he will be able to remove it.
You should go to see your optician and ask him to help you remove the stuck lens immediately. Try also inserting some contact lens solution or sterile saline to see if you can move it by washing it out.