can you help me, please

Somebody can explain to me how I can register because when Í want to register can not put my cell phone number I'm from argentina and well also scan the code to sing up well once you scanned it, it took me straight to the play Store and asked me to register wich Wechat and well Í also tegisterd with that and entered the game to have if I can register with what I registered with Wechat and well either does not let me someone can help me please