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Hello how to use this item? Explain please!

I don't know how to turn this stone on, please explain?

5
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Step 1: check your desired champ for the rank up arrow (the light blue arrow on top right of its avatar).
Step 2: choose upgrade
Step 3: you will see the gem on the lower right portion of the screen. Tap to use
Since ur gem is silver, it is a generic one and can be used on any champ of the said star level (4 star).