I have purchased a second hand icandy apple, got it a couple of weeks ago and the lady folded it about 5 times and I thought I knew how to do it, however I came to use it today and I have been trying for about 3 hours to try and fold the pushchair but I cant do it, can someone tell me what to do? I thought the lady pulled the handle all the way up and then pressed this button on the side but when I do this it does nothing, any help please?