only one dc motor spins

Other Hardware Motors, Mechanics, Power and CNC
14

I didn't connect the servos to pins 9 and 10, is that the part of the paragraph you were talking about?

Yes, that's the right bit, however, there's this

//Motor B
const int motorPin3  = 10; // Pin  7 of L293
const int motorPin4  = 9;  // Pin  2 of L293

Please post the code you are using, not something that doesn't compile.