(Can you tell I have not been here long?)
I managed to find the username in the "List Warriors" search feature. They are the same level as me (Lvl. 5) and it said they were "Inside Dwelling". I know they are a member of a clan, but I checked in quite a few dwellings (all of Konoha & Fire) and did not see their name listed. Later, they were logged on and in Fire Country, but I could not find a way to 'slay' or attack them.
Obviously, I might be missing these options. I have read through the FAQs, but right now, I am having a badnav.php problem. I petitioned (which I think is the correct procedure), but have not heard anything yet.
Thanks again.