1) Login to your account, go to your pledge amount, and ADD THE COST OF YOUR ADDITIONAL REWARD(S). (For example, say you pledged $100 for THE WHOLE SHE-BANG, and now you'd like to also get your name in the liner notes, FAME. You would simply add $150 to your first pledge for a total of $250. Don't try to select both rewards; Kickstarter won't let you.
3) Send us a message telling us which additional rewards the pledge increase was for.
4) We will fulfill all the rewards for you!