I've gone through the topics for adding new buttons, and I understand the basic concept, and what file to edit. If there's something I've missed please let me know. I'd like to add an extra link/button to the main menu of the default template. The other topics discuss how to add buttons to the classic template, so the coding is different. I'm still a PHP newbie, so please go easy on me. Thanks!
im gueesing you are using 1.0.7 if so the way to add buttons is the same no matter the theme, so they should work on the default theme. = http://www.simplemachines.org/community/index.php?topic=12633.0
If you are using RC2 then you will need to add them as a tab = http://www.simplemachines.org/community/index.php?topic=63203.0
Thank you, adding tabs was just what I needed.