Please help me enable username & password in openVPN module.

[mxfarooq]

Hi there,
I have two VPN servers, they are working on different ports than the default port.
every thing is beautiful however when ever the user has the ovpn configuration file and the certificates, I like them to enter their username & password before login.
I am setting this service module by module and so excited. I really appreciate everyone's help.
I am a very quick learner.
regards,
mFarooq