Absorbing the Energy inside Spirit Stones is actually very simple, but if you don't know the basics, it can be very difficult. This was exactly the situation Ye Tian had been in.
Spirit Stones contain powerful Spiritual Qi, an energy that every Martial Artist can absorb. However, to absorb this energy, you must use the energy within your Dantian to resonate with it.
After achieving resonance for the first time, it's no longer necessary. You can then absorb the energy directly, and the amount you can take in depends on your body's capacity to withstand it.
After learning the method from Ye Feifei, Ye Tian immediately put it into practice. He covered the Spirit Stone with his right hand and began to slowly sense the energy within it. The prerequisite, however, was that he had to channel his Dragon Spiritual Power into his palm.
