Mhnn... I checked on several browers now and it works on my end. When you click the '...' at the options, you need to select and mark the input field, deleted the 'your name please' and enter your own. Was that maybe the problem?
Let me know if it works. Also, don't worry for the name not immediately showing up in the stats then, it's set to only appear there once you also set what Charlie calls you nickname-wise due to how the stats will show the full name.