To pledge to a project, just click the green “Click To Fund This Project” button on any project page.
You will be asked to enter your pledge amount and select a reward. Then you will go through the Paypal checkout process.
Paypal is the only payment option for now. You must have Paypal account to fund projects.
When the project reaches its target date and funding goal.
Actually, your Paypal account will be charged, it not necessarily mean your credit card will be used. It depends on the payment preference in your Paypal account.
Projects have an Estimated Delivery Date under each reward.
This date (month and year) is entered by Developers as their best guess for delivery to backers.