Let me explain the concept of damping exercise.It is such an important exercise that we submitted at year D01,2014,We were asked to submit it in year D02, 2015. Now we are asked to submit it in year D03, 2016.If you closely look at damping exercise no 54,page 102 music sheet."X" sign tells, not to move your finger.
1.Place your right hand thumb on "D" string.
2.Place your index finger on "G" string.
3.Place your middle finger on "B" string.
4.Place your ring finger on "e" string or #1 string.
This is a basic setup of your fingers.Non of finger move,get loose from is respective position.All fingers are firm stay on their potions.
Once ready just use the thumb to pluck "D"string for 1/8th note and returns back to its "D" string damping it.When thumb return,index finger get activated and pluck the "G" string for 1/8th note and returns to its "G"string to damp it and rest it.During this thumb and index activity,your other fingers remain stay seated on their respective positions.If you don't have enough practice,these fingers will get loose and move away from their position.It is challenging to discipline individual finger to respond freely without influencing other fingers.I can not judge watching your right hand if your fingers respond freely of each other or not.With practice you will be able to move independently each finger as you desired.Later we will perform exercises much more complex.Hope this may explain the concept of this exercise.