Lets say I want to change where it says (login - register) to another language how do I change those 2 words ? where do i edit them?
ACP > languages
You need to edit the global.lang.php language files in the Admin CP.
Look for "welcome_login" and "welcome_register"
Where do i find this "global.lang.php????
global.lang.php is located at the inc/languages/*Your Language* folder. However, it's easier to edit it in AdminCP > Configuration > Languages > *Your Language*. Click on options, then Edit Language Variables. Then to the right of global.lang.php, just click edit, and find welcome_login and welcome_register.