Game explanation

Hi everyone I am new to the forum so forgive me if this has already been asked. I have been playing this game daily without fail I think I am hooked. However there is a lot I don't get and can't find answers to. XP how do you find your XP level/number ? I have a 3 star bird at level 50 but cannot evolve it, why not? Some of the battles have a blue circle in the floor looks like a circular ice ring but what is this for ? That's is for now any answers would be greatly appreciated.
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