Why can't I change my username for Mount and Blade Warband: Full Invasion 2

Ok so, I have successfully installed Full Invasion 2. However, I want to change my profile name. When I went to Full Invasion 2 and went to the page where it says Host a Game/ Join a Game, I look on my left and see my profile, character, etc. I click on my name which says New_Player. A box drops down and says New_Player and New_Player again below. So, I don't know what to do. I don't want my name to be New_Player forever. Please help me and reply back as soon as possible. Thank you.

There is a button called Edit, you can change the name there.

Thanks for helping me. It actually works. By the way, I saw you today in a server. Great job on the battlefield. And sorry about for how long I didn't reply.

Uhh.. Which server? I was on extra_invasion but it was killing my FPS (due to being on wave 45 or so) and then switched to wolfpack.

I saw you at that server Extra_Invasion. After when you left, I didn't know which server you went to. So I just stopped playing and logged out.