Yes, it is available. I have just tested and it works fine.
16:18:49 Order FILLED at 33.21054 RUB (#225451475 SELL 0.001 mil. USD/RUB @ MKT) - Position #57486691
16:18:49 Order ACCEPTED: #225451475 SELL 0.001 mil. USD/RUB @ MKT - Position #57486691
16:18:48 Order SELL 1000 USD/RUB @ MKT had been sent at 2014-01-06 16:18:48 manually
Does the platform give you any error message? Have you been trying to enter the market while it was closed?