Good day, I bought minecraft and downloaded it. In order to play minecraft I have to choose a name. When I choose a name, only a problem appears that says "Try restarting the launcher, if it doesn't solve it, write to mojang.." It didn't help, I can't change the name even through minecraft.net, I can't even change it through another web browser (Google chrome , Firefox), I've been playing minecraft for a long time, but only through a warez account.. Otherwise, I've tried absolutely everything, running through the administrator or something like that.. Thank you very much and please help. And on minecraft.net when I want to change the name, I click on "change name" and only the frame is green then gray then green... there's just a mistake somewhere. It can't be done via phone or laptop. I am using Labymod and new version of Java.. 
it doesn't matter at all, it's still not known why the name can't be changed, it's Mojang's fault, it does it to a lot of people.

For more informations, i will give here screenshot. Thank you so much team
Player:1