Extremesupply.com generally allows customers to cancel or change their orders as long as those requests are made before the order has been processed and shipped. To initiate a cancellation or request a change, it is advisable to act quickly. Once an order is in the fulfillment process, making changes may not be possible. Customers may want to check the specific cancellation policy on the current web page to understand the details and any applicable time limits. It is often helpful to provide the order number and relevant details in order to expedite the request. This way, customers can ensure they receive the best assistance possible with their order.