Need the router name and model. The phone line should go from your comp. to the router and then to the phone jack. The router probably has a firewall in it that has to be configured for limewire to work. The make and model should be on the router somewhere. If you can't find it you may have to call your isp to find out.
If you can find that I will try to help you(I'm no expert), but there are instructions at this link.
Connection problems? Check here first!