Take a male to male jumper(j.) wire and attach it to a digital pin with PWM capabilities. Put the other end of that j. wire to column in the breadboard. In this column of the breadboard, the transistor's base pin will go here too.

Secondly, take another male to male j. wire and plug it into the 5V power pin on the Arduino. This j. wire will lead to a separate column from the digital pin and transistor's base, attaching to the collector of the transistor.