check button.
-- How to upgrade your Attribute Gems? ---
> Navigate to your Attribute Gem Tab/Screen, access 'Manage Attribute Gems,'
choose the item you wish to upgrade, and then click on the upgrade button.
(Ensure that you unequip the unlocked Attribute Gem before upgrading it)
> All Attribute Gems can be upgraded and disassembled, and
successful upgrades increase attributes.
> The success rate and the required materials for upgrade vary according
to the gem grade.
> When upgrade fails, it remains on the same level status.
> Upon upgrade failure, a certain amount of upgrade materials may be
returned to you.
> From certain grades and levels, you can use the Sealed Crystals,
which increase the success rate.
> Materials used for upgrade and sub upgrade materials are consumed
regardless of whether the upgrade succeeds or fails.