Hello!
All orders are processing automatically and its execution can be instant or may take some time. While orders remain active, your funds are still on account — see "Reserved" column in "Finance" section. Please note that the orders execution can occur in parts, and it is necessary to wait until its full completed.
To understand it better, take a look at the "order book", which located on the left and right from the order filling form at standard exchange website version. If your buy order was created and instantly executed, there was such a sell order with price you set or lower (with sufficient or superior amount). Same if your created sell order was instantly executed, there was such a buy order with your price or higher (with sufficient or superior amount).
If your orders remain active after a long period of time, we recommend checking the relevance of the price and, if necessary, canceling and re-creating the order.
To cancel your order, find "Active Orders" tab under the order book and click "Cancel" next to the order you need. Partially executed orders can also be canceled if necessary, however, only unused part of funds will be transferred from "Reserved".