Deb, this is probably too late, from what you said, and it is not as precise as I would like. But here goes anyway, just in case it's useful.
On the Start Menu, select Settings, then Control Panel. On the Control Panel, you should be able to go one of two ways:  Go to "Network and Dialup Connections" and let the Wizard walk you through "Make New Connection", or  Go to "Phone and Modem Options", find the current "location" and edit it.
The reason I can't be more precise is that I don't use a dialup, don't have a modem, so there are some parts of the setup I can't test, and can't get past, without giving information that (in my case) doesn't exist. Maybe this will be enough of a guide nonetheless. Good luck.