Old Home Cube camera user

My home cube was brought back to the store and set up by someone else that returned it. How do I erase the old user name, and add mine. The store I bought it from won’t take it back

Hello! Are you referring to the VAVA Home Cam base station? I would like to ask for the model number for example, VA-HS002 or VA-HS003 so we can better look this up for you. Thank you.