Wireless network problem

Hey anyone!

A complete technodolt here. I have new Vostro 1500 notebook--Windows XP--I cannot seem to follow instructions on setting up a new wireless connection while away from home. I have been physically connected to a wireless router but would like to do it wirelessly.

Problem number two. Since I have been here, away from home, I receive all of my incoming mail but cannot send any mail. Do I have to set up some sort of proxy or something. I really don't know what that is either, but have heard of it.

Sorry to be so imcompetent.