Upgrade weapons and talismans by using the Assembly Window. To check if an item can be upgraded hover over it. If it has an empty glyph or signet slot, or already has a signet or glyph on it, the item can be upgraded. Press Y to open the window.

To upgrade an item, place it on the materials grid along with a signet or glyph. If the item can be upgraded, the ASSEMBLE button will turn green and the upgraded item will appear in the Item slot. Click ASSEMBLE to complete the upgrade.

If the item already has an upgrade in its glyph or signet slot it will be replaced by the newest upgrade.