That chip is a dual h-bridge, is it a L293D?
2 digital, 1 pwm is for 1 motor, 2 motors you need ofcourse 4 digital and 2 pwm.
if its a L293D
On ENABLE 1 and 2 you put an PWM signal, this is for changing the turnin speed of the motors.
It can be the same pwm, but both motor will turn the same then, best is to use 2 PWM signals so you can set the individual speed of each motor.
Input 1 and 2 is to set the direction of the motor, this needs to be a digital pin. its something like this:
00 motor float both pins low
01 motor forward pin 1 high, pin 2 low
10 motor backward pin 1 low, pin 2 high
11 motor break pin 1 and 2 high
This is the same for input 3 and 4, but has to be 2 different pins.
VSS needs 5v and vc is the direct battery.