To donate/pledge to a project, first make sure that you're logged in to your Kickstarter account. Then, just click the green “Back This Project” button on any project page.
On the next page, you'll enter your pledge amount and select a reward tier. If you select a reward that involves shipping, you'll be prompted to include this additional amount in your pledge.
After selecting "Continue to next step," you'll confirm your payment details. If you've backed a project before and saved your card details, you can use them over again. If not, you'll need to enter your credit card details manually.
If you want instruction with graphics please click here: https://www.kickstarter.com/projects/718033815/gym-beans-wearable-toiletries/posts/1141010