how can i get username &password of openvpn cilent?

as title.I was install openvpn cilent on Iphone. but i haven't username and password.i don't know how to get it.help me.

debbie10t wroteWhat server are you trying to connect to ?

I don't know.Is there a UserID can connect to difference server on ios ?

debbie10t wroteWhat server are you trying to connect to ?

like this.

What does the solution is??