I can't access because it said: Different ip and no internet conection. How to fix it?

Hi. I had my Book Live Duo stored for a long time and now I try to connect it to a different computer from the original Mac where I set it the first time. It is giving a signal (green light) but in the Dashbord it tells me that it has no internet connection (and I do not know how to connect it) and also tells me: Your My Book Live Duo no longer appears to be at the previous IP address. Please direct your browser to your devices new IP address¨…but I do not know how to do that. All the settings are very complex for me to understand, I need step by step help please to fix it or to know how to reset it from scratch. Thank you so much!!! Carolina