Navigate to the Order Management screen by clicking on the "Orders" tab on the Marketplace. 

Your order will be shown in the Orders table, where it will either be in the Awaiting Confirmation section (for orders that still need to be actioned) or in the History section (for past orders). 
Orders which are in the Awaiting Confirmation section can be actioned by selecting one of the following options:

• Cancel (Cancelling an order means that the funds that were moved as part of the order placement, are reversed. No fees were moved to the Mesh Fee account.)

• Accept  (If you would like to Accept an order, add a price and select “ACCEPT”, if your specified amount falls into the slippage range specified in the order, the order state will be updated to “ACCEPTED” (the funds will proceed as allocated). If your specified amount does not fall into the slippage range specified in the order, the order state will be updated to “FAILED” (reversing the funds that were moved).)

• Decline (Declining an order means that the funds that were moved as part of the order placement, are reversed. No fees were moved to the Mesh Fee account.)

Orders which are in the History section will be in one of the following states:

• Accepted

• Settled

• Declined

• Cancelled

• Under Investigation