Have been given a Mybook blue rings (single drive) How to I reset it to log into it

I have been given one of these drives and I can access its public folder but I cant get into its admin panel. The guy no longer knows what his credentals are. I just wanna wipe it new but dunno how to access it.

Theres no CDs with it either.

How do you log into it. Does it have a IP address or must you absolutely need software to get into it. Also can I use this with OSX? I presume so coz I was able to access its public folder from Mac. But I have Windows too.

Actually I have managed to log into it now. But is it possible to format this drive? there is a folder I Cant seem to get rid of on there. I see no options under drive management to format?

Thread moved to WD Network Products: My Book World Edition.