MyBB Community Forums

Can someone explain where should i change font size of this ??
Look at my forum, http://www.forumistan.net/showthread.php?tid=1332
Using very small font in showthread.

Very Thanks...

Can you specifically show which font you want to change? Which part of the page?

I want to change the font size which i am writing with now

Not in all the site, but only in showthread, my font color and size changed. Where can i change it ?

Screen:
http://www.resimekle.com/yukle/image/43516.jpeg