Hello,
You need go to admin area RealEstateManager : Settings - Administrator Settings - Price Options - Currency and add what you need. If you want to use other currencies, enter the values as: USD = 1; EUR = 3.15; or USD=; EUR=; Available for paypal currencies: AUD, CAD, CZK, DKK, EUR, HKD, HUF, JPY, NOK, NZD, PLN, SGD, SEK, CHF, USD ,RUB.
So for adding new Currencies you need turn off PayPal: RealEstateManager :: Settings - Payment settings - Show buy for booking: and Show buy for sale: put No.