Not sure which OS system you are using as you didn't specify. But go to your user preferences folder, find WireShare & open that folder. Delete the gnutella(.net) file but only whilst WireShare is closed. Then open WireShare again. Be patient for it to connect.

If you are having constant problems connecting then the problem might be firewall related. Make sure WireShare has an exception in your software firewall. You might also need to give the program & its port an exception in your router depending on router brand & model.