How can I find my Roblox username?

Method One:
Enter the game and press "Esc" on the left conner of your keybaord, then you will see this, the name with "@" is what we need. For example, if it is the username in the picture below, you need to fill in "pssmurf0081" in the order page when you purchase the item.

Method Two:
Go to Roblox client homepage and then you will see your username on the right part. For example, if it is the username in the picture below, you need to fill in "pssmurf0081" in the order page when you purchase the item.

Tips: Refreshing the page or re-entering the game to check items after the order is done will be better.