To check the status of your orders, first, click More on your Dashboard menu:

Then click on My Orders:

The list of all of your orders will be displayed, you can see the status of the order (active, canceled, filled), the coloured stripes indicate whether the order was for SELL (red colour) or BUY (green colour)

By clicking on a specific order you will be able to see more detailed information about that order and from here you are also able to cancel or edit an order (if the order has not yet been finalised, filled):

If you are looking for an older order, that is not displayed on the first page, you can do so via the search on top of the page:

You can also use filters for easier search, just click on the more icon, and a menu of filter will open up: