For more explicit directions, because this is a common problem (rot13) -
Rnpu cbgvba lbh pensg zbqvsvrf gur jbeyq zrgre - cbfvgvir be artngvir, qrcraqvat ba vs vg'f Yvtug be Qnex nffbpvngrq. Trggvat gur jbeyq zrgre gb gur znkvzhz / zvavzhz (500) va rnpu nern haybpxf gur bgure 2 Fbatf. (Juvyr 500 fbhaqf yvxr n ybg, rnpu znk yriry cbgvba tvirf 25, zhygvcyvrq ol hc gb 10 qrcraqvat ba gur crepragntr erfhygf.)