You really need this answered don't you? Speel?
Seriously Though. There are many ways in which to improve your spelling capability, but it depends on what type of learner you are - Visual, Oral, Kinaesthetic, etc. My advice would be to learn in the way you find most comfortable. Try visualisation, word games, suicide, etc. Try taking a page out of the 4th grade english textbook - read, cover, copy, check, repeat.