How do I increment a friendname to say the next name in the index?

1 
friendNames = ['Joan', 'Ronan', 'Nikita', 'Augustus']

# Array indices start at 0, not 1!
friendIndex = 0

# Loop over each name in the array.
# The len() function gets the length of the list.
while friendIndex < len(friendNames):
    # Use square brackets to get a name from the array.
    friendName = friendNames[friendIndex]

    # Tell your friend to go home.
    # Use + to connect two strings.
    self.say(friendName + ', go home!')

    # Increment the index to get the next name from the array.
    friendName = friendNames[friendIndex]
    
# Go back and build a fence to keep the ogres out.
2

You simply add one to friendIndex. Use friendIndex += 1.