Magic stones

Hi there guys!!! First of all amazing game loving it so far....(character l.37) Just a little question is there any way to use the magic stones or as soon collected they are in "use"? Thank you
Same problem
When you are the limit upgrade of an item the button UPGRADE becomes BREAK and for each 5 stones of a kind you can break the limit Rare items from +60 can go to +61 Epic items from +80 can go to +81 Legendary items from +100 can go to +101 .....
Thank you very much really helpful!!
Reset means?