どうやって~ is the format to ask someone how did he/she do/did something, right?
like どうやって出来ましたか = how did you managed to do it
in anime, i often hear 何やっているの for 'what're you doing' type of questions. why isn't there any particles between 何 and やって? is it a colloquial form?
どうもありがとうございます