You have of store credit. To use it, simply place your order and you will be able to choose store credit as the payment method when it comes time to pay for your order.
Pre-order items take 8-12 weeks to arrive once they are ordered. Please read the listings and the blog post for each pre-order round for more information.
Please do not purchase pre-order items and in stock items in the same transaction. You will be refunded for your pre-order items if you purchase in stock items in the same transaction.