A/C: Loosen 14mm nut on pulley and tighten 12mm tensioning bolt.
Alternator: Loosen the 12mm clamping bolt and tighten 12mm tensioner
bolt. (This is probably the loose one.)
Power steering: Loosen the top 12mm mounting bolt, pry pump (not on body
of pump) as necessary and retighten bolt.
If this isn't obvious to you, you may wish to consider having someone else
do the work for you. It leads me to believe you have no experience
tensioning belts and could damage your vehicle.