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.
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