How can I make the Swype keyboard type "I" when I press "i", now it types "ki"?
Open up the memo application (or anywhere that you can enter text), enter the "ki" that's giving you problems, highlight it and hit the Swype key on the lower left; it will prompt you to delete the word.

In general it will remember new words that you enter; you may have to type them out letter-by-letter first.