how do you contact a member

OK so just,

1st, on any page you are on, go and select "Search", within the black bar area towards the left side top.

2nd, go on the right side and put in the user name in the "search by user name" area.

You would of course have to know the members user name(or have a close idea, because the recorded/not necessarily currently logged in member user names do appear to pop up if you enter at least the first 3 characters of the user name). Do not know of a location that simply lists all user names that are not logged in.