yes?

Carole put IP in first field and port number in second (often seperated from IP by ":", do not enter it just put port in second field, port number is usualy 6346).
However you don't need to do this, Xolox will search servers automatically (using so called host caches which provides hundreds of other servants). I would say this is more a nerd option: You can use it to share with friends (enter your friends IP and port to trade with him/her)... or if you meet people you wanna trade often with (enter their IP/port).

Maybe you ask why is this feature, can't I trade with everyone? Short answer, no gnutella is too big to trade with everyone... you are connected to a so called horizon, which means the servers you have access to, you can see, around 1000 - 50000 servers. You will find more details about gnutella here: What is Gnutella?

Hope it helps, Moak

PS: To the Xolox developers: What is a typical horizon within Xolox, how many hosts do we connect with?
PPS: Maybe it is a good idea to seperate all nerd option from the normal preferences. To keep Xolox simple for rookies, and give an advanced-nerd-making-happy-full-statistics-and-tuning-options-extra window. Without understanding Gnutella or a big help file it makes no sense to give newbies those options.... they will be confused only. After a while I like your idea of a simple servant.