SMARTBLOND: I'm assuming your 10-speed is a roadbike. If so, then a 10 year old bike will have two little levers on the downtube (the tube running from the handlebars to the cranks). One of them will control shifting to the front ring, the other will control shifting to the rear. When you pedal, shift those little levers and the chain should move to a different gear.
I'm assuming that you've also not maintained the bike for a while so your first stop would be to the local bike shop for a tune-up and a hands-on lesson about gear changing.
In God we trust, all others bring data. - W. Edwards Demings
If God invented marathons to keep people from doing anything more stupid, the triathlon must have taken Him completely by surprise. -P.Z. Pearce
Sheldon Brown is a great resource for anything related to bikes. http://www.sheldonbrown.com/gears.html
I suggest that you 1. buy a book or two on riding & maintaining your bike, 2. watch and ask questions on this site, 3. consider joining a local bike club, 4. maybe start a relationship with local bike shop, best if you can work with the bike club that sponsors the bike club...
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