MyBB Source

I'm not sure if this is possible, but is there a way that I could add a custom tab into the admin panel, if so.. where would I put it at in my files...

It could be tabs like "Home, Configuration, Etc." or like one of the choices on the sidebar, if either one is possible....

I never have messed around with files that go to the adminCP

You can make your own tab, but you have to know PHP. The easiest way is to copy and of the folders in the admin/modules folder and then rename it. The most important file in those folders is the module_meta.php which you would have to edit to add your files in.