Put in SA (Weapon)

So, we opened a window in the Services - Put in SA (weapons).

The first step is to move the weapon to the appropriate cell.

The Soul Crystals cannot be extracted, but the current one can be replaced by another by simply dragging it to the desired cell.

Then we move the previously selected Soul Crystal (alt+b => Shop => Boost => SA for weapon) to the appropriate cell, select the desired stat and click Register. To do this you need the R-grade Gemstone (alt+b => Shop => Standard Shop => Consumers)

Now we do the same with the second Сrystal. The third cell is available for Mystic Soul Crystal. Click Start.

Click ok.

Success!