Well i have run into problems. I dont know what is wrong with my script! The code is starting to make me feel dizzy. I need to buy computer glasses, but anyways, i scanned through the code and im just frustrated. The first part doesnt even happen. I am annoyed, please help me. The code:

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p = pc --password = passwordchange
x = 50 --this is for the colors at the end.
y = 100 --this too
z = 255 --and also this
n = tpt.get_name() --this gets the user's name
tpt.message_box("The default password is: Password") --tells you the default password
s = tpt.input("Authentication required.","Please authenticate that you are "..n,"Password") --asks it
   if s == p --if s is equal to the input password
      then do --then
      c = tpt.input("Change password?","Y/N") --it asks to change password
   end
end
   
   if s == "Password" and pc == nil --if it is the default pass and pc = nil then let you pass *
      then do
      pc = tpt.input("Password Change.","Enter new password here:"  --prompts you for a new pass
      end
   end
end
   if s ~= p --if the password is incorrect, display a message saying so.
      then do
      tpt.message_box=("Authentication failed.","Your authentication is incorrect. Try again.")
      os.exit() --then quit when you press OK
   end
end
   if c == "Y" --checks if you answered Y to the password change.
      then do
      pc = tpt.input("Password Change.","Enter new password here:" --if so it asks for a new password
   end
end
   function Text()
   tpt.fillrect(237,188,tpt.textwidth("Welcome, "..n.." to The Powder Toy!")+5,13,x,x,x) --making back
   tpt.drawtext(240,191,"Welcome, "..n.." to The Powder Toy!",y,y,z) --adding text
   x=x-.1 --decay rates
   y=y-.2 --more
   z=z-.4 --more
      if z == 0 --delete the box when all color is gone, otherwise it would hide part of the screen.
         then do
         tpt.unregister_step(Text) --same thing going on
      end
   end
end
tpt.register_step(Text) --run the function "Text" every frame

--done

--***i am not sure if "and" exists. i use it in java, so ya... :/

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Why wont it work? Please help me! EDIT-any help? no one?? D: