Need some guidence on phpBB

[MacPC]

Hi,

I am a complete newbie to phpBB. I just installed it on my mac. I have a stupid question. In the header of the forum page, it says yourdomain.com,
I want to change that and the small texts underneath it, I searched many files but I could find the file that contain these text, can someone tell me where it is? Also where go I go to config phpBB?

Thanks.

MacPC.