1. Click the blue "Manage" button at the top of the campaign page.
2. Click "Change your pledge" on the next page.
3. Add the cost of the add-on(s) you want to your "pledge amount." Keep in mind that the amount you enter is the *total* amount you're pledging, so should be the sum of your initial pledge amount plus the cost of the add-on(s) you want.
4. When the campaign ends, you'll tell me which add-on(s) you want in a survey that I'll send out.
Thanks for your support!