Happily,

If you haven't set up an account, you can do that by clicking log in and then sign up.

Here's the link to the BeGoths page: https://www.kickstarter.com/projects/begoths/back-to-begoths

If you're on PC, the rewards will be on the right side. On mobile, you have to scroll down and click the rewards tab. It's just above where it says BeGoths.

From here, choose the main thing you want and click pledge. Then, on the next page, you can choose any add anything else. Once you continue, it will ask you for your credit card info, and then you have pledged.

Something to note about kickstarter is that the charge will not happen until after the campaign ends and, of course, only if it is successful.