How do I figure out what server I'm in?

I am trying to fill out a request to change my summoner name because of privacy issues and it asks me for a server.So i am not sure what it is asking me to do.Any help would be appreciated,thank you.
1
Comments
I have the same problem
and it will work like a charm
I have requested to change my email adress. The request is perfectly success. Well, write Global in the server section.