Action script Frame/Button Help

Hi I am not new to Flash but I am new to Action Scrtipt and since I am trying to make a flash theme for my website I need alot of help. Lets start off by saying I downloaded a theme already made i just gotta edit the text. That easy enough for me. What I want to know is how I can edit the destination of the flash buttons they are set to move across the page on a marquee. I am able to find the individual file but when I try putting in

getURL("", "_blank"); 

it responds Cannot Make this change cause mouse settings can only be done to a button. I understand I have to switch it to Action - Button some one help and please tell me how.