I struggled with that a good half an hour and couldn't get it to work with http://community.nodebb.org/user/_self_/settings. It would just get an error page.
The way it worked for me is:
http://community.nodebb.org/me/
Note the final slash, without it it won't work!
If you want to get into your settings, use: http://community.nodebb.org/me/settings.
NodeBB is an awesome piece of forum software. Congratulations to everyone involved! 
