MyBB Community Forums

Hi,
I need to have custom URLs for my forums. for example:
"http://domain.com/about" should display "http://domain.com/forumdisplay.php?fid=25"
or

"http://domain.com/learn" should display "http://domain.com/forumdisplay.php?fid=41"

I have more than 200 forums!

Please help. If it's not possible directly in MyBB please tell me the best suitable bulk URL redirection or url shortener script which is compatible with mybb. 
My server is Nginx+MyBB 1.8.4

Thanks

You'll need to install this plugin: http://community.mybb.com/thread-101262.html

See: http://community.mybb.com/thread-75646.html to update it to 1.8

I've installed google seo before but where can I define custom urls?! I think it only has the ability to define the patterns of URLs and it creates URLs based on forums or threads names. I want to choose the names myself.

You can change them in the Google SEO url settings group.

In which part of url settings?!! I want to specify custom URLs for each forum, not only the name of its subject in URL.
For example I want this:
Custom URL that I want to create its name: "http://example.com/topic_A20"
Real MyBB url: "http://example.com/forumdisplay.php?fid=254"
Forum's name: "This is a sample Topic about URLs"

Tried dot.tk free domains install forums on dot.tk domains