It's really easy to add blues. Collect alchemy material from mobs. Defuse them with void rondo's from the grocery shop. Get the right amount of elements needed to fuse a stone (you can read the amount of elements needed for each kind of stone on the tablet).
Then use the stone on the item and hope that it worked
For example:
You want to add HP on your chest (8D). First you need a stamina tablet 8D. There you see what type of elements you need and howmuch. Once you get those elements open the alchemy window (Y) on material processing. Put the tablet first and then the elements. Press fuse and you got yourself a stamina stone 8D.
Then go to att. enhance put the 8D chest and then the 8D stamina stone press fuse and then you will see if the stone worked.
BUT: if you are trying to put blues on an item make sure that you put the blue "steady" on it first. There is a chance that your item will become dura invalid if you do not habe steady on your item.
Also if you created the stone you will see a % (5, 10, 20, 30%) it could be that something will go wrong if you try to use the stone on the item. It can change another stat better or most of the time worse.
Or you can just buy the item already pimped
