The PIC32MX250F128B has 9 analog input lines with 10 bit resolution. They are numbersed as A0 - A8 and can be used with this name in the code. For compatibility with the other examples, I will stick to the pin names in my array. If I connect a 10 kOhm poti to GND and 3.3V and the middle pin to pin 2 on the left side, I can use this code to read the analog input (please note that the maximum voltage is 3.3V not 5V!)

/*
 Code based on Analog Input
 Created by David Cuartielles
 Modified 4 Sep 2010 by Tom Igoe
 modified 31 Dec 2014 by Mathias Wilhelm
 This example code is in the public domain.
 http://arduino.cc/en/Tutorial/AnalogInput
 */

const uint8_t LEFT=0;
const uint8_t RIGHT=1;
uint8_t nP[2][8] = {{0,17, 9,10,11,12,13,14},{18,17, 1, 2, 3, 6, 7, 8}};

int sensorPin = nP[LEFT][2];    // select the input pin for the potentiometer
int ledPin = nP[RIGHT][2];      // select the pin for the LED
int sensorValue = 0;          // variable to store the value coming from the sensor

void setup() {
  pinMode(ledPin, OUTPUT);  
}

void loop() {
  sensorValue = analogRead(sensorPin);    
  digitalWrite(ledPin, HIGH);  
  delay(sensorValue);          
  digitalWrite(ledPin, LOW);   
  delay(sensorValue);                  
}

It seems to be a good idea to connect the servo to the right side as above to combine the code:

/*
 Control a Servo via a poti
 Created  31 Dec 2014 by Mathias Wilhelm
 */

const uint8_t LEFT=0;
const uint8_t RIGHT=1;
uint8_t nP[2][8] = {{0,17, 9,10,11,12,13,14},{18,17, 1, 2, 3, 6, 7, 8}};

#include <SoftPWMServo.h>

int pos = 0;             // variable to store the servo position, in microseconds
const int pin = nP[RIGHT][4];    // Choose _any_ pin number on your board
int sensorPin = nP[LEFT][2];    // select the input pin for the potentiometer
int ledPin = nP[RIGHT][2];      // select the pin for the LED
int sensorValue = 0;          // variable to store the value coming from the sensor

void setup() {
  pinMode(ledPin, OUTPUT);  
}

void loop() {
  sensorValue = analogRead(sensorPin);
  pos = map(sensorValue,0, 1023, 1000, 2000);
  SoftPWMServoServoWrite(pin, pos);
  delay(25);
}