How do I close out a trade?

Retail forex transactions are normally closed out by entering into
an equal but opposite transaction with the dealer. For example, if
you bought Euros with U.S. dollars, you would close out the trade
by selling Euros for U.S. dollars. This is also called an offsetting or
liquidating transaction.

Most retail forex transactions have a settlement date when the
currencies are due to be delivered. If you want to keep your position
open beyond the settlement date, you must roll the position
over to the next settlement date. Some dealers roll open positions
over automatically, while other dealers may require you to request
the rollover. Most dealers charge a rollover fee based upon the
interest rate differential between the two currencies in the pair.
You should check your agreement with the dealer to see what, if
anything, you must do to roll a position over and what fees you
will pay for the rollover.