Derailleur installation adjustment method
For B tension screw I suggest you to just have look at this video
 B tension adjustment
Steps to adjust your rear derailleur


Drop the chain to the smallest cog of your cassette.
Tighten the cable.
Loose the cable tention by turning the cable tention screw.
Align the upper pulley just benith the cog and slightly inward using the H high limit screw.