MDE and Linking Tickets

[Mambo Junkie]

I'm tying up all loose ends for my upcoming trip nest week, and on my MDE it has my reservations, tickets, dining, fastpasses, etc. It says Don't see your tickets? Link here. I also have the hard tickets in addition to my mbs. Do I need to link them? Also, if I changed my tickets (added a day) will the hard ticket still be valid?