Delicious bookmarking

Wow! Did this every mess me up! I am not that computer dumb- but I could not figure this out. I tried to set up an accout with Del.icio.us- but was unable to because I did not have administrative ok on this computer - so I could not download any software- I then looked at an easy tutitorial ( uh) not so easy. I still am not at all certain how this works or what I would every use it for. I understand it is like looking into others files- and organizing your bookmarks- but I would have to have a handson workshop with this site.