I want to change my username, how can i do that?
It’s generally a Bad Idea to change usernames. If it’s changed, previous referrals to that user break. That’s why it’s not “recommended”.
But YES, you can change it, if you wish.
In that’s the case, simply inform (your current username, and new desired username) to some of the moderators, and they will change it for you → About - telecomHall Forum
And they will fix any broken shortcut if you was eventually mentioned in some conversations.
Note: All the other information on the profile can be accessed and changed by you! 
You can find this answer ALSO in our FAQ: Custom FAQ