Exchange rate is the rate at which one country's currency is changed for another country's currency. For example the rate at which one dollar can be changed for pound sterling or any other currency.
In freely traded (not restricted) currency pairs, Covered Interest Parity absolutely drives the forward price. This is through arbitrage
In restricted currencies it may or may not drive the forward...
That depends on what you DO know. You might consider asking again, being more specific about what information you have. For example, if you know the amount of interest, the principal, and the length...