how to use runge kutta fourth order & 3-step Adams-bashforth method to solve pendulum problem?

a pendulum is suspended from a sliding collar. The system is at rest when the oscillating motion y(t)=Asinwt is imposed on the collar, starting at t=0 .The differential equation describing the motion of pendulum is :

(-g/L)sin(theta)+ [(w^2)(Acos(theta)sinwt ]/L

and plot theta versus t from t=0 to 10

g=9.81 , L=1.0 ,A=0.25 ,w=2.5 rad/s

how to use runge kutta fourth order & 3-step Adams-bashforth method to solve this problem ?? please help cheers