ok so I do have both item as mentioned in the guide.....homewer.....neither item offer me the option "use" while "clicking" them

does the character has to be level 111 for the use option to be available ? or do I have to be in a specific quest(like dr,montague and enemies part for example) ? or is it only possible after install the online version//quests ? or lastly....is it episode specific(haven't bother try this last possibility due to it being unlikely to be) ?

I did try the following though without success(both items are on the same character of course(lvl 95))...brightness circle is a lvl 111 item for info
armor equip then try to use the star amplifier
armor unequip then try to use the star amplifier