If you want to be able to access the players username in your game. You can easily do so by using ajax in construct 2 with the below URL.
https://play.idevgames.co.uk/request/user
The below example shows how simple it is to display as text. Make sure you add AJAX object to your project:

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i have a question i want to show to username on browser alerts but it didnt work first i tried to set it to the global text username and the alert shows nothinh then i tried to the alert to say the AJAX.LastData it didnt worked too or is it only because i didnt published it yet and is in a local host it dont work?