To pledge for multiple rewards, simply add the totals together for all rewards you would like to purchase, increase your pledge amount to cover all the rewards you wish to back. Afterwards, send us a message that includes the rewards you've pledged for and we'll add a note to your account.
You may have noticed that Kickstarter does not allow you to pledge twice. You may use the link above, or refer to the previous FAQ to learn how to increase your pledge amount to cover both items you wish to pledge for.
Don't see the answer to your question? Ask the project creator directly.