Bonus Changer
Since switchbots are illegal this is the only way to make changing bonuses a bit easier.
Step 1:
Open the Expand Window button between the 4 and F1 keys on the bottom of your screen. It looks like a brick wall, right in the middle:
Step2:
Select the 2nd box that popped up, called Bonus Change:
Step3:
On the left side put your item that needs to have its bonuses changed.
On the right you need to put Enhance Change Scrolls (you can get them from the Armour Shop Dealer).
Press Change and good luck because that is all you need! 