Default question on fring

installed fring on couple Aria's

it appears to want to use a source (had no contacts at all) so I allowed it to load list of contacts from google voice

now, when I use it, it only calls the google voice contact but I would like to enter a fring userid who has fring installed, can't seem to find option how to enter?

example: someone else is on fring with userid "fring_12345" - how do I tell fring to open a chat or call to that person? the fring_12345 is also another Aria user.