You can't actually edit a .SWF file as it is the published version of a .FLA file, if you have the fla file which can be opened in flash mx, 8 and cs3 then you need to edit the action script for the redirect. this can usually be found at the end off the time line on one of the layers. indicated by a small "a" above a "o" the action script should look something like this.
Code:
replay.onRelease = function()
{
gotoAndPlay(1);
}
getURL("http://www.opalinefashion.com/first.html");
stop(); just change the URL in the getURL
to match what you want.