You need to move the bike to a position so as the tightest part of the chain is in the middle of the bottom of the chain between the front and rear sprockets.
Put the bike in the side stand, loosen the rear axle and the rear calliper torque arm.
Turn the adjusters evenly in a clockwise direction. When you have the correct tension on the chain. Tighten up the rear axle and then the torque arm bolts.
Remember, you need to tighten the chain at it's tightest point.
A chain that does not receive regular care will not last long. When a chain is past it's best it deteriorates very quickly.
Check how far you can pull the chain off the rear sprocket. Do this right at the end of the sprocket at the rear of the bike. If you can pull it off more than a quarter of a tooth then the chain is fubar.
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