Simply Put
You need to know how to use your first and second finger equally so if you use your first finger as your main then try some of the exercises with your second/middle finger, and if you only use your second finger try some of the exercises with just your first/index finger. Also practicing switching fingers mid-exercise to help your control over the fretboard and your hand.
Right Hand Legato/Hammer ons and Pull offs
This is (by far) the hardest technique in acoustic tapping, just like you would do hammer ons and pull offs with your left hand(fretted hand) you will now being doing that with you right hand (tapping hand). The positioning of your hand/arm will be slightly different in order to perform this technique, hold your hand adjacent to the fretboard. You will be using
ALL YOUR FINGERS but mostly your 1st, 2nd, and 3rd, act as if you fingers were playing the piano, but push very hard.
Try the first Exercise:
For those of you that are still a bit confused, you are going to tap the 9th fret (with your 1st finger) then without pulling off you are going to hit the 10th fret (with your 2nd finger) then once again tap back to the 9 (with your 1st finger). This exercise shouldn't be that hard because we are only using the first two fingers we have always used.
This won't show up very much in the later tutorials so there will only be one more exercise and its pretty simple yet very hard to stay consistent. You can use your 3rd finger or your 4th finger for the last note which ever feels most comfortable.
While doing this exercise with your right hand fret the 5 with your left hand to prevent any noise sounding. Practice this little tetrachord over and over again until you feel comfortable using all your fingers.
The beauty of this technique is that you can learn to play strong and advanced melodies with your right hand, and learn to string together complex harmonies.