1. Közösség
2. Technical Issues and Workarounds
3. Why can't I change my username?

 Wait, why does it say Sal Khan? I'm confused.

1. Közösség
2. Technical Issues and Workarounds
3. Unable to type in answer

A similar thing keeps happening to me too.

1. Közösség
2. Technical Issues and Workarounds
3. I am the right age, have been on khan for over three days, and have 5,000 energy points, and still can't upvote or comment on programs

I had this same problem but it got fixed 1 year later and my brother waited the same amount of time but he still has this problem.

1. Közösség
2. Feature Requests and General Site Feedback
3. DARK MODE PLEASE

Why don't you just use the brightness setting on your device?