mercedes car?

"my car is locked bcuz the battery on my car has gone flat ..so fob dont work... i hav not got the spear key that cums with the car ...so i need 2 open bonnet 2 charge my battery ... so i can use my fob 2 open door 2 my car ..so untill i charge my battery am lock out ..i hav removed the front grill were the lock is.. an i hav unlocked the right side of my bonnet but cant unlock other side ..cuz i dont hav a clue how i did it haha..pls pls can any 1help as am a single mum with a 5yr old so really need my car.. i hav mercedes 230 commpeser sport 1998