changing log on page

Just wandering if we have permission and are allowed to modify some pages to change say the following,
CHANGE THE SUBSONIC LOGO TO SAY MY OWN
AND ON LOG IN PAGE
Though i would just ask as i would like to customize it.
Can anybody point me in the right direction to the files for log in and main page that i need to edit..
Thank you Daniel
PS , Donating member
CHANGE THE SUBSONIC LOGO TO SAY MY OWN

AND ON LOG IN PAGE

Though i would just ask as i would like to customize it.
Can anybody point me in the right direction to the files for log in and main page that i need to edit..
Thank you Daniel
PS , Donating member