How to edit a pledge in crowdfunding?
Yes, you can freely edit your pledge in crowdfunding until it's paid. As soon as your pledge changes its status to "Paid in full", only the creator can change your pledge. You can still add items to it, but you can't change the paid pledge content by yourself.
For example, if you accidentally added the wrong language option for the game and you paid for the order, you have to contact the creator so that they can change it for you. If you want to cancel the paid order, you also have to ask the creator to do it for you.
Once the order is paid, you cannot remove any items by yourself. You also have to contact the creator to get a refund for this specific item. The creator can make a refund either by adding credits to the backer's account or by giving back the funds.