You didn't speciy the brand or model, so this is generic. On the right side of the saw there are ususlly two nuts on the sprocket cover. Loosen them enough for the bar on the saw to move up and down. Then, looking at the bottom of the bar from the front, you'll see a slotted screw which loosens or tightens the chain slack.
Hold the bar up by the tip and using a long heavy screwdriver, tighten (to the right) that screw until you see/feel the chain tightening on the bar.
Not too tight. You should be able to put on a pair of gloves and grasp the chain on the top and pull it toward you easily.
By the same token there should be no place where the chain droops away from the bar. If you grasp the chain with a thumb and forefinger it should pull away from the bar a 1/4 to 1/2 ".
Holding the bar up still, tighten the two nuts firmly so the chain will not become loose again.
The hotter the chain gets during sawing the more it will stretch. Be prepared to tighten it occasionally.
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