Wrong network connected

[harveyjb3]

Hi there,
My PC is connected to one of my old networks which is now changed for some reason, which has a really slow speed but i can still connect to it. My new network is not allowing me to connect to it when I try and add it to the existing connection, as it says it is already existing. Can any one help me then connect to my new connection/network?
Thanks

 

[svalbaard]

Sorry, this is the sort of question that is impossible to answer on a forum without 1001 screenshots and questions due to the number of configuration possibilities and nuances of how networks work.