if you have your room number you should be able to walk directly to your room.
however if you have a dining plan or want to use your magic band to purchase things you'll need a pin for it.
if you did not set that up during online check in or its set up from a previous trip and you don't remember it you will need to go to the online check in desk to set it up.
personally when i went in april i had already had a pin from 2 previous trips and did remember what it was so i did not need to go to the online check in desk.
but just last week my sister who had had a pin from a previous trip could not remember it and did need to go to the online check in desk to reset it.