Still pretty new and not sure what I am doing wrong. I just got lvl 9, spent my point in the speed tree (the only thing I could choose was sonic speed) and it tells me to hold down the flight key (F by default) when flying to go super speed. I have tried it many times and all it does it take me out of flight and I fall. Is this as bug or what is happening? I even tried relogging, nothing helps!
The F key is just toggle movement mode. Don't remember which key toggles super speed but if you go to settings one of the tabs gives a listing of the key binds to toggle super speed will be listed there and will even give option to change if want to
You have the press the numlock key while using your movement previously activated with the F key. I'd suggest you to change the key binding of numlock to R.
Nowadays, the R key summons your combat ally. I remapped the super speed key to the ' key, the tick mark/tilde key, to the left of the 1. It's near all the other movement keys, but not in the way, so I'm not hitting it by accident. The only issue I have with it is that it isn't trapped by chat, so if I type a ` in say, a shout, I go blasting off in the last direction I moved in, until I can hit the key again and turn it off. So set the speed key to a key that isn't already in use that's convenient to you. But R is now taken by the combat ally.