Links not working
 

Okay so i am brand new to VBulletin and just go my site up and running. I'm pretty new to all of this.
I seem to be having a problem with my homepage link. When i click on either the logo (what used to be the VBulleting logo) or the homepage folder, it takes me to a webpage that does not exist. When i just mouse over the logo i see that it ends with the name of mywebsite.php and not index.php.

I have absolutely no idea how to go about fixing this. When i first did the installation i did not have this problem. After the first day this started happening and I have no clue how to fix this.

If someone could point me in the right direction i would appreciate it. If it helps the website is http://www.metsfansforums.com/forums/ maybe going there would help you understand the problem if you click on the apple logo.

Thanks for any help!