Is there a sure-fire way to reset a version 1 C50

I Really need help here - cannot see the V1  C50 on the LAN I have another (bought new ) v2 C50 

Do I need to disconnect my other C50? That's at 192 l.168.0.50 is that address hardwired into the C50? Are these conflicting ???

I can't work out how to change the wifi names the default wifi names are visible 

thanks 

Allan