You can put it wherever you want or you can remove it.
First, congratulations for this work, this is awesome. I'm currently trying to adapt it to one of my project, what do I have to write to respect the license. Is something like 'Powered by NodeBB - Copyright 2013' acceptable ?
Look at the current footer. I'd think something like that would be appropriate!
I'm not a lawyer, and I don't pretend to be one, but the license for NodeBB can be found here.
Specifically, it states that you are free to modify and publish derivative works based on NodeBB, as long as the original copyright notice (the license) and authorship remain intact.
If you are also publishing your project source, the NodeBB derivative must also be published, with the same GPLv3 license.
Attribution itself in the forum is not covered by the license, and you may remove it as you see fit, although of course, attribution would be appreciated
Just to make sure: can I edit source code of it? I have website and I want to make single login system for website and forum, so i will need to remove registration page and edit some other pages. The first line of license say "Everyone is permitted to copy and distribute verbatim copies of this license document, but changing it is not allowed." so I am not sure Definitely I would leave a footer with attribution.
as per the license you're free to modify the source code @dove
when you're done, send us a message so we can add a link to your site on our blog!