can't connect
 

Hi all,
I just downloaded LimeWire 2.6.3 and I can't connect
I've tried to fill in all those servers I saw in another thread, but I can't connect to any of them.
I try to fill them in in Tools>options>connections,
but all I can do there is choose whether or not I want to connect on startup, I can't fill in any servers or do anything else.
It might be because I am behind a proxy, yet I cant disable it, since it is my ISP's proxy :-)
is there any way to fill in a proxyserver in LimeWire?
or is this not my problem?
any help would be appreciated :-)
greetz,
HoD