Python username and password program
A few points:


You can simplify the if loop by using the else condition.
Getting input should be at the beginning of the while loop, because it makes more logical sense to put it there. It's what happens every time you restart.
You can use the simple condition of True for your while loop.
You don't need the continue keyword, as it is at the end of your loop.




count = 0 
while True: 
    userName = input("Hello! Welcome to FaceSnap! \n\nUsername: ") 
    password = input("Password: ")
    count += 1
    if count == 3: 
        #tells user bye
        break #exit
    else:
        if userName == 'elmo' and password == 'blue':
            #let them in
            break #they are in, exit loop
        else:
            #tell them it is wrong and have them retry, stay in loop