MrsL, welcome,
Kelly is right, the page set up is directly under the File menu, in the fourth division. If you did not have a word processor running, you may not need to change page set up. You will see a picture of a vertical page, [portrait] and a horizontal page [landscape] click on the one you want. Usually the vertical [portrait] is what you would use most, as that is the standard 8 1/2 " by 11 " page that we are most used to reading. You will want to use "US letter" setting in the window with the little arrows on it.
hope this helps.
The 6100 is a good machine, and although some would consider it to be slow it is much faster than some of the earlier machines. It is dependable, and unless you are going into graphic arts on a high speed modem, you probably will be very happy with it.
Our son told us when we got our first computer, that it would be a love - hate relationship. After many years, it still is. [there is a curl hidden on the forehead of every computer]
Shalom
wd