Some questions

Hi guys. I am new to LoL (I came from Dota 2) and really enjoy it so far, but I'm struggling with a few things I can't seem to be able to sort out. These are: 1. In Dota 2 I used to press A and point at the creep to last hit, it was quick cast, but in LoL you have to press A and then make another click on creep. I really used to Dota 2 lasthit with A and can't use right mouse button or anything else. 2. I had LoL account from ages ago, now I play it. The thing is I don't like the nickname I've chosen ages ago. Is there a possibility to change the actual ingame name somehow?
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