On the rear you can increase spring preload with the big metal nut the spring is sitting on. Undo the locknut, set the big one to your preferences, tighten the locknut.
On the bottom of the shock you have small plastic ring for rebound damping adjustment. Just turn it around, it should (but most of them do not) click when in one of the five positions marked on the ring with numbers, looking from the left side of the bike. 1 - no damping, 2 - normal, ... 5 - full damping.
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