All the accounts are accessible within MetaTrader, once you are on the platform, you will see different symbols that will determine what account you're in.
The .pro, .var and .mini symbols may not be showing so you will need to add them to the Market Watch.
Here are some examples:
EURUSD = Standard ECN account: Majors pairs have a medium spread and $6 commission.
EURUSD.pro = Pro ECN: PRO pairs have low spreads with $10 commission.
EURUSD.var = VAR pairs have no Commission and higher spreads.
EURUSD.Mini = Smaller lot sizes (Contract size is 100x smaller) with $1 commission